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Intel i486 OverDrive
  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 OverDrive chips
» all 486 chips
 
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.
 
add comment
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.
 
add comment
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.
 
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
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.
 
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 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.
 
add comment
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
 
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 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.
 
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 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.
 
add comment
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.
 
add comment
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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