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Intel 486
  Intel A80486DX-25
  Intel A80486DX-33
  Intel A80486DX-33, DX Logo
  Intel A80486DX-33, DX Logo (SL enhanced)
  Intel A80486DX-50
  Intel SB80486DX2-40
  Intel SB80486DX2-50
  Intel A80486DX2-50
  Intel 486DX2-50 (IBM)
  Intel A80486DX2-66
  Intel A80486DX2-66 (write-back cache)
  Intel A80486DX2-66 w/ Cooler
  Intel A80486DX2-66 OEM
  Intel A80486DX4-75
  Intel FC80486DX4-75 Mobile
  Intel FC80486DX4-75 Mobile Module
  Intel A80486DX4-100
  Intel FC80486DX4-100 Mobile Module
  Intel RapidCAD-1
  Intel RapidCAD-2
  Intel A80486SX-20
  Intel A80486SX-25
  Intel A80486SX-25, Ceramic Lid
  Intel KU80486SX-25
  Intel A80486SX-33
  Intel SB80486SX-33
  Intel A80486SX2-50
  Intel 486SX2-50/SA OEM
  Intel KU80486SL-25
  Intel OverDrive ODP486SX-25
  Intel OverDrive ODPR486DX-25
  Intel OverDrive ODPR486DX-25 (V3.0)
  Intel OverDrive ODPR486DX-33
  Intel OverDrive ODPR486DX-33 w/o Cooler
  Intel OverDrive ODPR486DX-33 (V3.0)
  Intel OverDrive DX2ODP50
  Intel OverDrive DX2ODP66 (V4.0)
  Intel OverDrive DX2ODPR66 (V3.0)
  Intel OverDrive DX2ODPR66 (V4.0)
  Intel OverDrive DX4ODP75
  Intel OverDrive DX4ODPR75 (V1.1)
  Intel OverDrive DX4ODPR100 (V1.0)
  Intel OverDrive DX4ODPR100 (V1.1)
» Intel overview
» all 486 chips
 
The Intel i486 DX Processor
The 486 is very similar to its predecessor, the 386. Main differences are an optimised instruction set, an on-chip unified instruction and data cache, an optional on-chip floating-point unit (FPU), and an enhanced bus interface unit. These improvements yield a rough doubling in performance over an 386 at the same clock rate.
 
The 486 processor has been licensed or reverse engineered by other companies such as IBM, AMD and Cyrix. Some manufacturers made hybrid 386/486 CPUs (Cxrix Cx486DLC, Texas Instruments TX486DLC), having a 486 instruction set and a 386-compatible pinout. The RapidCAD is a 486 DX with 386 pinout and dummy FPU chip for upgrading 386 systems to 486 technology.
Intel A80486DX-25
Intel A80486DX-25 Top Side
A80486DX-25
SX328
L1141153
INTEL (M) (C) 1989
Intel A80486DX-25 Back Side
90446471CD
USA
L 03
Donated by Christian Lederer. Thanks a lot!  
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:April 10, 1989
Manufactured:week 14/1991
Made in:USA
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX328
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486DX-33
Intel A80486DX-33 Top Side
A80486DX-33
SX329
L0480254
INTEL (M) (c) 1989
Intel A80486DX-33 Back Side
90365861CC
USA
L 46
Donated by Christian Lederer. Thanks a lot!  
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:May 7, 1990
Manufactured:week 48/1990
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX329
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486DX-33, DX Logo
Intel A80486DX-33, DX Logo Top Side
A80486DX-33
L4201158
SX729
INTEL (M)(C)1989
Intel A80486DX-33, DX Logo Back Side
7407438FAA
MALAY
CJ 420
INTEL (M)(C) 1989
Donated by Jorge Segovia. Thanks a lot!  
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:May 7, 1990
Manufactured:week 20/1994
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX729
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486DX-33, DX Logo (SL enhanced)
Intel A80486DX-33, DX Logo (SL enhanced) Top Side
A80486DX-33
C4170154
&E5V1X SX810
INTEL (M) (c) '89 '92
Intel A80486DX-33, DX Logo (SL enhanced) Back Side
54070790CC
A4
EE 17
'&E' markings: SL enhanced CPU (Processor includes power management features).
 
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:May 7, 1990
Manufactured:week 17/1994
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX810
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486DX-50
Intel A80486DX-50 Top Side
A80486DX-50
C2512054
SX710 T
INTEL (M) (c) 1989
Intel A80486DX-50 Back Side
C2423713CA
A4
CB 51
The last i486 with core frequency equal to bus frequency, introduced in June 1991. It was followed 1992 by the DX2 with clock doubled core frequency.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
To run it at its 50MHz, this Intel chip demands a heatsink. To over-clock this chip, it demands a heatsink-fan (purpose designed for the later DX2 -66 {and hotter} chips). I overclocked the only one I ever bought. It ran at 60MHz all day long. (with the heatsink-fan of course). I failed to overclock it at 66MHz. I never knew whether it was the m/board chipset chips, or the -50 CPU that failed at 66MHz. Could have been either, since the chipset chips were also stamped -50.
 
For a long time, Intel only supplied samples of the i486DX -50 CPU to OEMs. This went on for nearly one-year. The 50MHz M/Board was a real "trouble-maker" at the time, and no 50MHz supporting chipsets had ever been in use before this time. Until then, less reputable OEMs had made 4-layer M/Boards alongside the more-expensive 6-layer M/Boards. This had the double-expense to these low-grade OEMs, of needing to make 6-layer boards only, for 50MHz operation throuhgout, and to source expensive 50MHz supporting chipsets! With Intel's long holdup of commercial volumes of -50 CPUs, these nasty OEMs had time to re-develop stable 50MHz M/Boards. However, one-year later when consumer 50MHz 486 systems flowed freely in the marketplace, many "clones" were still very unstable, due to 4-layer designs persisting still, and due to non-use of a heatsink on the CPU (as extra cost-cutting)!!! The -50 was the first x86 CPU to demand a heatsink. N.B. the later-on i486DX2-50 did NOT require a heatsink, but usually came fitted with one anyhow. (I guess the system builders had gotten used to fitting heatsinks by now).
 
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Core Frequency:50 MHz
Board Frequency:50 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:0.80
Voltage:5 V
Introduced:June 24, 1991
Manufactured:week 52/1992
L1 Cache:8 KB
CPU Code:i486 DX
P4
Intel S-Spec: SX710
Package Type:Ceramic
PGA-168
Socket: 2/3
top of page
Intel SB80486DX2-40
Intel SB80486DX2-40 Top Side
SB80486DX2-40
C3500582
&E3V1X SX809
INTEL (M) (c) '89 '92
Intel SB80486DX2-40 Back Side
add comment
Core Frequency:40 MHz
Board Frequency:20 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:3.3 V
Introduced:March 3, 1992
Manufactured:week 50/1993
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX809
Package Type:Plastic
PQFP-208
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Intel SB80486DX2-50
Intel SB80486DX2-50 Top Side
SB80486DX2-50
C5211026
&E3V1X SX920
INTEL (M) (c) '89 '92
Intel SB80486DX2-50 Back Side
add comment
Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:3.3 V
Introduced:March 3, 1992
Manufactured:week 21/1995
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX920
Package Type:Plastic
PQFP-208
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Intel A80486DX2-50
Intel A80486DX2-50 Top Side
A80486DX2-50
L4370115
&E5V1X SX808
INTEL (M) (c) '89 '92
Intel A80486DX2-50 Back Side
94234804AA
MALAY
ET 437
INTEL (M)(C) 89 92
Comment by Paul Collins (pi314aussie[at]yahoo.com):
This chip was the great saviour for OEMs and system builders. Unlike the DX-50, the DX2-50 didn't demand a heatsink for use. Unlike the DX-50, the DX2-50 didn't demand OEMs to build quality advanced 50MHz-throughout M/Boards. Many early VESA VL-BUS add-on cards would mis-behave when the M/Board was running at 50MHz-throughout. By building a system based on a DX2-50, system builders could sell stable reliable 50MHz-CPU-systems that were only 3% to 15% slower in "real-world" apps. than when using same-for-same BIOS and logic M/Boards, built using DX-50 CPUs. Any DX2-50 end-consumer system (with VL-BUS cards) always ran all programs faster than any 33/40MHz end-consumer system using only 16-bit ISA cards. Thus the DX2 -50 was the saviour.
N.B. once the DX2-66 was common, slower 50MHz systems were "always" built with the DX2-50 or (rarely) the SX2-50. The DX-50 systems fell into non-supply except for the vary rare EISA BUS M/boards (they were mostly 50MHz, except for the EISA circuitry, which was still at 33MHz even then).
With Intel supplying the DX2-50 cheaper than it supplied the DX-50, it was one really really great chip.
 
add comment
Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 3, 1992
Manufactured:week 37/1994
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX808
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel 486DX2-50 (IBM)
Intel 486DX2-50 (IBM) Top Side
486DX2-50 03H4938 PQ
IBM9314 P100649E
COPYRIGHT INTEL '89 '92
1 MFG BY IBM
Intel 486DX2-50 (IBM) Back Side
An i486 DX2 manufactured by IBM
 
add comment
Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:March 3, 1992
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel A80486DX2-66
Intel A80486DX2-66 Top Side
A80486DX2-66
L4180048
&E5V1X SX807
INTEL (M) (c) '89 '92
Intel A80486DX2-66 Back Side
'&E' markings: SL enhanced CPU (Processor includes power management features).
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
When this chip came out, I had a "huge" form-factor (full-AT-size) 486 M/Board. It had sixteen SIMM sockets, but had no clock-crystal socket. This was before end-user jumpers for clock generators were around, thus I was locked into 33MHz, due to the crystal being soldered. I tested a DX2-66 CPU in this giant M/Board, but the (very very) early BIOS didn't let it work. If I wanted to use a 66MHz chip, then I needed a new M/Board that supported such things. By then, the newer M/Boards also had settings for DX4's as well.
The DX4-100 soon followed into the market. As a result, I bypassed the i486DX2-66 altogether, and bought the latest and greatest i486DX4-100. So, I never experienced to joy of owning a -66.
 
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:August 10, 1992
Manufactured:week 18/1994
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX807
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel A80486DX2-66 (write-back cache)
Intel A80486DX2-66 (write-back cache) Top Side
A80486DX2-66
L4452189
&EW5V1X SX955
INTEL (M)(C) '89 '93
Intel A80486DX2-66 (write-back cache) Back Side
94356286NA
MALAY
ES 446
INTEL (m) (c) 89 93
'&EW' markings: SL enhanced CPU (Processor includes power management features) with write-back cache.
 
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:August 10, 1992
Manufactured:week 45/1994
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX955
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel A80486DX2-66 w/ Cooler
Intel A80486DX2-66 w/ Cooler Top Side
i486 DX2
A80486DX2-66
C3330365
SX759
INTEL (M) (c) 1989
Intel A80486DX2-66 w/ Cooler Back Side
53220500CB
A4
CR 33
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:August 10, 1992
Manufactured:week 33/1993
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Intel S-Spec: SX759
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel A80486DX2-66 OEM
Intel A80486DX2-66 OEM Top Side
Intel A80486DX2-66 OEM Back Side
95125316AB
MALAY
GH 519
INTEL (m) (c) 89 93
i66
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,200,000
Circuit Size:0.80
Voltage:5 V
Introduced:August 10, 1992
L1 Cache:8 KB
CPU Code:i486 DX2
P24
Package Type:Ceramic
PGA-168
Cooler
Socket: 1/2/3
top of page
Intel A80486DX4-75
Intel A80486DX4-75 Top Side
Intel DX4
iCOMP index=319
A80486DX4-75
C439106W
&E 3VOLT SX884
INTEL (M)(C) '89'93
Intel A80486DX4-75 Back Side
24290790CA
A4
39
add comment
Core Frequency:75 MHz
Board Frequency:25 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,600,000
Circuit Size:0.60
Voltage:3 V
Introduced:March 7, 1994
Manufactured:week 39/1994
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SX884
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel FC80486DX4-75 Mobile
Intel FC80486DX4-75 Mobile Top Side
intel DX4
iCOMP index=319
FC80486DX4-75
C5181009
&E 3VOLT SK052
INTEL (M)(C) '89'93
Intel FC80486DX4-75 Mobile Back Side
add comment
Core Frequency:75 MHz
Board Frequency:25 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,600,000
Circuit Size:0.60
Voltage:3 V
Introduced:March 7, 1994
Manufactured:week 18/1995
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SK052
Package Type:Plastic
PQFP-208
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Intel FC80486DX4-75 Mobile Module
Intel FC80486DX4-75 Mobile Module Top Side
intel DX4
iCOMP index=319
FC80486DX4-75
4370668
& 3VOLT SX883
INTEL (M)(C) '89'93
Intel FC80486DX4-75 Mobile Module Top Side Intel FC80486DX4-75 Mobile Module Back Side
This CPU-module is the processor inside my IBM Thinkpad 755C from 1995. To take a picture of it about 40 screws and lots of circuit boards, cables, plugs and shieldings had to be removed inside the Thinkpad - hard work.
 
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Core Frequency:75 MHz
Board Frequency:25 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,600,000
Circuit Size:0.60
Voltage:3 V
Introduced:March 7, 1994
Manufactured:week 37/1994
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SX883
Package Type:Plastic
PQFP-208
top of page
Intel A80486DX4-100
Intel A80486DX4-100 Top Side
iCOMP index=435
A80486DX4-100
C4190405
&E 3VOLT SX900
INTEL(m)(c)'89'93
Intel A80486DX4-100 Back Side
24061650CB
A4
EE 19
Donated by Christian Lederer. Thanks a lot!  
Comment by Paul Collins (pi314aussie[at]yahoo.com):
When this chip was the latest and greatest new kid on the block, I upgraded from my then 486 33MHz system. I had to replace my then M/Board, as it didn't support "ANY" clock-multiplier CPUs. see comment for A80486DX2-66.
Within months of having my new speed, the AMD 5x86 and Cyrix 5x86 came on sale. The AMD was a clock-quadrupler. The Cyrix was still a clock-tripler, but advanced 5th generation style. Maybe the AMD should be more rightly called an AM486DX5-133, since inside it is still identical to all other 486's. My brand new M/Board's BIOS didn't know these two new chips, so I bought the AMD -133 chip and got a BIOS update at the same time. The AMD behaved unreliably in my system, so I exchanged it with the shop for the Cyrix. (The BIOS update included both). So to end my story, I only got about two-months use from this Intel A80486DX4-100 CPU. N.B. It is nearly a decade later, and I'm still using Cyix 5x86 CPU's.
 
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,600,000
Circuit Size:0.60
Voltage:3 V
Introduced:March 7, 1994
Manufactured:week 19/1994
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SX900
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel FC80486DX4-100 Mobile Module
Intel FC80486DX4-100 Mobile Module Top Side
intel DX4
iCOMP index=435
FC80486DX4-100
C5121081
& 3VOLT SK053
INTEL (M)(C) '89'93
Intel FC80486DX4-100 Mobile Module Back Side
add comment
Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,600,000
Circuit Size:0.60
Voltage:3 V
Introduced:March 7, 1994
Manufactured:week 12/1995
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SX883
Package Type:Plastic
PQFP-208
top of page
The Intel RapidCAD is a specially packaged Intel 486DX (RapidCAD-1) without the internal cache and with a standard 386 pinout and a dummy FPU designed as pin-compatible replacements for an Intel 80386 processor and 80387 FPU. Since the 486DX has a working on-chip FPU, a dummy FPU package (RapidCAD-2) is supplied to go in the Intel 387 FPU socket. It contains a simple PAL (Programmable Array of Logic) whose purpose is to generate the signals normally generated by a 387 coprocessor to provide 287 compatible coprocessor exception handling in 386/387 systems motherboards.
 
References:  RapidCAD information at CPUShack
Intel RapidCAD-1
Intel RapidCAD-1 Top Side
RAPIDCAD-1
SZ624
V2153006 A2
(M)(C)1989 1991
Intel RapidCAD-1 Back Side
C1504374CF
USA
EE 12
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1991
Manufactured:week 15/1992
Made in:USA
Intel S-Spec: SZ624
Package Type:Ceramic
PGA-132
top of page
Intel RapidCAD-2
Intel RapidCAD-2 Top Side
RAPIDCAD-2
SZ625
L2154188 A0
INTEL(M)(C)1990
Intel RapidCAD-2 Back Side
61509442AM
MALAY
EAG 214
add comment
Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Introduced:1991
Manufactured:week 15/1992
Made in:Malaysia
L1 Cache:8 KB
Intel S-Spec: SZ625
Package Type:Ceramic
PGA-68
top of page
Intel A80486SX-20
Intel A80486SX-20 Top Side
A80486SX-20
L1173927
SX406
INTEL (M) (c) 1989
Intel A80486SX-20 Back Side
91043031CD
USA
EE 15
Donated by SOFTWERK. Thanks a lot!  
Comment by Wingzero (wingzeroismine[at]yahoo.com):
The 486SX processors were the same as their DX counterparts in design, but the built in math co processor was disabled. There was a 487 which was actually a 486 with the math co processor enabled. If the motherboard had this slot for the 487, the SX cpu would be disabled and the 487 cpu would take over all processing.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Was the i486SX "Cripple-chip" really a planned release, or was it actually as rumoured to be, a genuine i486DX -33, that failed the FPU production-line tests???? I was donated an i486SX-20, and I was also donated a "full-size-AT form-factor" 486-33 m/board. This crazy-large m/board had an 80486 socket, and 4167 socket too. It also had sixteen (count them, 16) SIMM sockets, cause, what was a 16MByte SIMM??? It only understood 256kByte and 1MByte SIMMs, and it only understood the 9-chip SIMMs, not the later 3-chip SIMMs. This proved to be a bane to me, as the 9-chip SIMMs cost more than the newer/faster 3-chip units.
I put two-and-two together, and that little PGA SX-20 chip ran at 33MHz just fine. As a test, I tried to smoke-it-out by covering it with cardboard etc. to fry the thing. It would not stop running normally! (Without the cardboard), I ran it at 33MHz for years, before I sold that sytem. Last I heard, it still was fine.
 
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Core Frequency:20 MHz
Board Frequency:20 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:April 1991
Manufactured:week 17/1991
Made in:USA
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX406
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel A80486SX-25
Intel A80486SX-25 Top Side
A80486SX-25
L3152089
SX679
INTEL (M) (c) 1989
Intel A80486SX-25 Back Side
93086693AA
MALAY
BP 315
Donated by SOFTWERK. Thanks a lot!  
add comment
Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 15/1993
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX679
Package Type:Ceramic
PGA-168
Socket: 1/2/3
top of page
Intel A80486SX-25, Ceramic Lid
Intel A80486SX-25, Ceramic Lid Top Side
A80486SX-25
L5011191
&E5V1X SX903
INTEL (M) (c) '89'92
Intel A80486SX-25, Ceramic Lid Back Side
8434124GAA
MALAY
FP 501
INTEL (M) (C) 89 92
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 01/1995
Made in:Malaysia
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX903
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel KU80486SX-25
Intel KU80486SX-25 Top Side
KU80486SX-25
C3210347
SB5V2X SX763
INTEL(m)(c)'89'92
Intel KU80486SX-25 Back Side
Donated by Christian Lederer. Thanks a lot!  
This is an SMD package CPU mounted on a PGA board to fit into a standard desktop socket.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Great little sub-unit this! Overclocked it to 40MHz no probs. Used it for years and years. No heatsink needed at 40 either! Not bad for a so-called -25.
 
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 21/1993
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX763
Package Type:Plastic
PQFP-196 on PGA-168
Socket: 1/2/3
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Intel A80486SX-33
Intel A80486SX-33 Top Side
A80486SX-33
L4190737
&E5V1X SX797
INTEL (M) (C)'89'92
Intel A80486SX-33 Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 19/1994
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX797
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel SB80486SX-33
Intel SB80486SX-33 Top Side
SB80486SX-33
L4282009
&E3V1X SX855
INTEL (M) (C)'89'92
Intel SB80486SX-33 Back Side
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Core Frequency:33 MHz
Board Frequency:33 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,185,000
Circuit Size:1.00
Voltage:3.3 V
Introduced:04/1991
Manufactured:week 28/1994
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX855
Package Type:Plastic
PQFP-208
Socket: 1/2/3
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Intel A80486SX2-50
Intel A80486SX2-50 Top Side
A80486SX2-50
L5032202
&E5V1X SX845
INTEL(M)(C)'89'92
Intel A80486SX2-50 Back Side
8425471GAA
MALAY
FH 504
INTEL (M)(C) 89 92
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:900,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
Manufactured:week 03/1995
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX845
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel 486SX2-50/SA OEM
Intel 486SX2-50/SA OEM Top Side
Intel 486SX2-50/SA OEM Back Side
INTEL(m)(c)'89'92
Comment by Paul Collins (pi314aussie[at]yahoo.com):
I lusted for one of these! Time marches on, and I upgraded to Intel DX4 -100 after all. Never got to see one of these SX2's.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:900,000
Circuit Size:1.00
Voltage:5 V
Introduced:04/1991
L1 Cache:8 KB
CPU Code:i486 SX
P23
Intel S-Spec: SX845
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel KU80486SL-25
Intel KU80486SL-25 Top Side
KU80486SL-25
C2512142
MAA SX709
(M)(C)1989 1992
Intel KU80486SL-25 Back Side
First CPU specifically designed for Notebook PCs.
 
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Core Frequency:25 MHz
Board Frequency:25 MHz
Data bus (ext.):32 Bit
Address bus:32 Bit
Transistors:1,400,000
Circuit Size:0.80
Voltage:5 V
Introduced:Nov. 9, 1992
Manufactured:week 51/1992
L1 Cache:8 KB
Intel S-Spec: SX709
Package Type:Plastic
PQFP-132
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Intel 486 OverDrive Processors
Intel OverDrive processors are a category of various Intel CPUs that were produced to upgrade computers. ODP is the acronym for Over Drive Processor, however most OverDrives are ODPR (Over Drive Processor Replacement) chips: To upgrade a computer to a new processor you just replace it with the new one. Their interfaces appear to the motherboard like an older chip, so you don't need to worry about whether or not the motherboard supports the higher speeds. ODP chips (like the DX2ODP66 or the ODP486SX-25) in contrast were made for additional sockets on the mainboard, the Performance Upgrade Socket.
 
On older versions Intel labeled the OverDrive chips with the external local bus speed they supported, like the ODP486SX-25 and ODPR486DX-33. Since all these OverDrive chips have the clock doubling feature, it was assumed by Intel that everyone knows that the CPU runs at twice the bus speed internally. Newer chips follow the DX2/DX4 naming scheme of the i486 DX.
Intel OverDrive ODP486SX-25
Intel OverDrive ODP486SX-25 Top Side
ODP486SX-25
SZ676
C2281437 A2
INTEL (M) (c) 1989
Intel OverDrive ODP486SX-25 Back Side
C2166723CE
A4
EE 25
This is an OverDrive processor for an additional OverDrive socket on the mainboard.
Upgrades 25 MHz Intel 486SX based systems to 50 MHz.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Note the extra pin. It is a kind of "tell the other guy to shut down" pin. Implemented so that the end-user can just "add" this new chip into the spare upgrade socket, without any need of interfering with the originally supplied SX CPU. Ie. what end-user can remove a PLCC or even PQFP chip.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:1992
Manufactured:week 28/1992
L1 Cache:8 KB
CPU Code:i486 ODP
P4T
Intel S-Spec: SZ676
Package Type:Ceramic
PGA-169
Socket: 1/2/3
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Intel OverDrive ODPR486DX-25
Intel OverDrive ODPR486DX-25 Top Side
ODPR486DX-25
SZ697
C243502W B1
INTEL(M)(C)1989
Intel OverDrive ODPR486DX-25 Back Side
C2365083CB
A4
BM 43
Upgrades 25 MHz Intel 486DX and SX based systems to 50 MHz.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 43/1992
L1 Cache:8 KB
CPU Code:i486 ODPR
P4T
Intel S-Spec: SZ697
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive ODPR486DX-25 (V3.0)
Intel OverDrive ODPR486DX-25 (V3.0) Top Side
ODPR486DX-25
C4070536
SZ877 V3.0
(M)(C)1989 1992
Intel OverDrive ODPR486DX-25 (V3.0) Back Side
9343929GCA
A4
EE 07
Upgrades 25 MHz Intel 486DX and SX based systems to 50 MHz.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 07/1994
L1 Cache:8 KB
CPU Code:i486 ODPR
P4T
Intel S-Spec: SZ877
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive ODPR486DX-33
Intel OverDrive ODPR486DX-33 Top Side
ODPR486DX-33
SZ698
C240046W B1
INTEL(M)(C)1989
Intel OverDrive ODPR486DX-33 Back Side
C2294373CC
A4
BM 37
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
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Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Manufactured:week 40/1992
L1 Cache:8 KB
CPU Code:i486 ODPR
P4T
Intel S-Spec: SZ698
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive ODPR486DX-33 w/o Cooler
Intel OverDrive ODPR486DX-33 w/o Cooler Top Side
ODPR486DX-33
SZ698
C2522231 B1
INTEL (M) (c) 1989
Intel OverDrive ODPR486DX-33 w/o Cooler Back Side
C2441524CA
A4
BM 52
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
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Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 17/1994
L1 Cache:8 KB
CPU Code:i486 ODPR
P4T
Intel S-Spec: SZ698
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive ODPR486DX-33 (V3.0)
Intel OverDrive ODPR486DX-33 (V3.0) Top Side
ODPR486DX-33
C4050331
SZ878 V3.0
(M)(C)1989 1992
Intel OverDrive ODPR486DX-33 (V3.0) Back Side
8345591GCB
A4
EE 04
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 05/1994
L1 Cache:8 KB
CPU Code:i486 ODPR
P4T
Intel S-Spec: SZ878
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive DX2ODP50
Intel OverDrive DX2ODP50 Top Side BOXDX2ODP50, SZ932
Intel OverDrive DX2ODP50 Back Side
This is an OverDrive processor for an additional OverDrive socket on the mainboard.
 
Upgrades 25 MHz Intel 486DX and SX based systems to 50 MHz.
 
The Processor is still sealed in its original box.
 
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Core Frequency:50 MHz
Board Frequency:25 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
L1 Cache:8 KB
CPU Code:i486 ODP
Intel S-Spec: SZ932
Package Type:Ceramic
PGA-169
Cooler
Socket: 1/2/3
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Intel OverDrive DX2ODP66 (V4.0)
Intel OverDrive DX2ODP66 (V4.0) Top Side
DX2ODP66
C4500207
SZ933 V4.0
INTEL (M) (c) '89 '92
Intel OverDrive DX2ODP66 (V4.0) Back Side
94394054CC
A4
AG 49
This is an OverDrive processor for an additional OverDrive socket on the mainboard.
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
Comment by Paul Collins (pi314aussie[at]yahoo.com):
Note the extra pin. It is a kind of "tell the other guy to shut down" pin. Implemented so that the end-user can just "add" this new chip into the spare upgrade socket, without any need of interfering with the originally supplied SX CPU. Ie. what end-user can remove a PLCC or even PQFP chip.
 
add comment
Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 50/1994
L1 Cache:8 KB
CPU Code:i486 ODP
P23T
Intel S-Spec: SZ933
Package Type:Ceramic
PGA-169
Cooler
Socket: 1/2/3
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Intel OverDrive DX2ODPR66 (V3.0)
Intel OverDrive DX2ODPR66 (V3.0) Top Side
DX2ODPR66
C4370275
SZ904 V3.0
(M)(C)1989 1992
Intel OverDrive DX2ODPR66 (V3.0) Back Side
94394054CC
A4
AG 49
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
There is not much difference between an DX2ODPR66 and a standard 486DX2-66. Intel was marketing their speed doubling technology in different products. DX2 chips were sold to Intel OEMs and OverDrive chips were sold directly to end-users. The DX2 chips typically have no built-in heatsink and have a distinctive DX2 label. The OverDrive chips have a distinctive OverDrive label and may have a built-in heatsink.
The 'V3.0' and 'V4.0' marks the third and fourth stepping of the processor since introduction.
 
References:  pcguide.com  Intel
 
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Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 37/1994
L1 Cache:8 KB
CPU Code:i486 ODP
P23T
Intel S-Spec: SZ904
Package Type:Ceramic
PGA-168
Cooler
Socket: 1/2/3
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Intel OverDrive DX2ODPR66 (V4.0)
Intel OverDrive DX2ODPR66 (V4.0) Top Side
DX2ODPR66
C5240780
SZ935 V4.0
INTEL (M)(C)'89'92
Intel OverDrive DX2ODPR66 (V4.0) Back Side
Upgrades 33 MHz Intel 486DX and SX based systems to 66 MHz.
 
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Core Frequency:66 MHz
Board Frequency:33 MHz
Clock Multiplier:2.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:06/1993
Manufactured:week 24/1995
L1 Cache:8 KB
CPU Code:i486 ODP
P23T
Intel S-Spec: SZ935
Package Type:Ceramic
PGA-168
Cooler
Socket: 1/2/3
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Intel OverDrive DX4ODP75
Intel OverDrive DX4ODP75 Top Side
BOXDX4ODP75
Intel OverDrive DX4ODP75 Back Side

 
Upgrades 25 MHz Intel 486DX & 16/20/25 MHz 486SX based systems to 75 MHz.
The Processor is still sealed in its original box.
 
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Core Frequency:75 MHz
Board Frequency:25 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:10/1994
L1 Cache:16 KB
CPU Code:i486 ODP
Package Type:Ceramic
PGA-169
Socket: 1/2/3
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Intel OverDrive DX4ODPR75 (V1.1)
Intel OverDrive DX4ODPR75 (V1.1) Top Side
DX4ODPR75
C5291151
SZ958 V1.1
INTEL(M)(C) '89'93
Intel OverDrive DX4ODPR75 (V1.1) Back Side
A5051163CB
A4
29
Upgrades 25 MHz Intel 486DX & 16/20/25 MHz 486SX based systems to 75 MHz.
 
DX4 OverDrives typically have qualities different from standard 486s of the same speed. These include built-in voltage regulators, different pin-outs, write-back cache instead of write-through cache, built-in heatsinks, and fanless operation.
 
References:  pcguide.com
 
Comment by Hugh Russell (hugtheslug[at]yahoo.co.uk):
Also will upgrade DX-66 systems to a stable 100 mhz.
This is probably an overclock of the overdrive itself.
 
Comment by Hugh Russell (hugtheslug[at]yahoo.co.uk):
Forgot to add, 486 fan was attached to heatsink for extra cooling and stability.
 
Comment by Johann (lord80james2003[at]yahoo.com):
The Intel DX4ODP75 was designed for changing 25 MHz 486 systems to run at 75 MHz.
BUT. The v1.1 allowed 33 MHz systems to run at 100 MHz. The first version (1.0) could only bring the speed of a 33 MHz system up to ~83 MHz.
 
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Core Frequency:75 MHz
Board Frequency:25 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:10/1994
Manufactured:week 29/1995
L1 Cache:16 KB
CPU Code:i486 DPR
P4T
Intel S-Spec: SZ958
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive DX4ODPR100 (V1.0)
Intel OverDrive DX4ODPR100 (V1.0) Top Side
DX4ODPR100
C43507058
SZ926 V1.0
INTEL(M)(C) '89'93
Intel OverDrive DX4ODPR100 (V1.0) Back Side
24231670-Z
A4
36
Upgrades 33 MHz Intel 486DX & SX based systems to 100 MHz.
 
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:10/1994
Manufactured:week 35/1994
L1 Cache:16 KB
CPU Code:i486 DPR
P4T
Intel S-Spec: SZ926
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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Intel OverDrive DX4ODPR100 (V1.1)
Intel OverDrive DX4ODPR100 (V1.1) Top Side
DX4ODPR100
C5040328
SZ959 V1.1
INTEL(M)(C) '89'93
Intel OverDrive DX4ODPR100 (V1.1) Back Side
24441330CC
A4
20
Upgrades 33 MHz Intel 486DX & SX based systems to 100 MHz.
 
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Core Frequency:100 MHz
Board Frequency:33 MHz
Clock Multiplier:3.0
Data bus (ext.):32 Bit
Address bus:32 Bit
Voltage:5 V
Introduced:10/1994
Manufactured:week 04/1995
L1 Cache:16 KB
CPU Code:i486 DPR
P4T
Intel S-Spec: SZ959
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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