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Intel i486 DX
  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 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!  
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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: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!  
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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 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
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Intel SB80486DX2-40
Intel SB80486DX2-40 Top Side
SB80486DX2-40
C3500582
&E3V1X SX809
INTEL (M) (c) '89 '92
Intel SB80486DX2-40 Back Side
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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
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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: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.
 
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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: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
 
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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: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
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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.
 
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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
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
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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.
 
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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
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
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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
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
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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
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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
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
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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
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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 39/1994
L1 Cache:8 KB
CPU Code:i486 DX4
P24C
Intel S-Spec: SX884
Package Type:Ceramic
PGA-168
Socket: 1/2/3
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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
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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 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
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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
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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
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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
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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
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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
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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
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