cpu-collection.de >> Intel >> i486 OverDrive

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.

i486 OverDrive Old Naming Scheme

Intel OverDrive ODP486SX-25


ODP486SX-25 SZ676 C2281437 A2 INTEL (M) (c) 1989	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

Intel OverDrive ODPR486DX-25


ODPR486DX-25 SZ697 C243502W B1 INTEL(M)(C)1989	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

Intel OverDrive ODPR486DX-25 (V3.0)


ODPR486DX-25 C4070536 SZ877 V3.0 (M)(C)1989 1992	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

Intel OverDrive ODPR486DX-33


ODPR486DX-33 SZ698 C240046W B1 INTEL(M)(C)1989	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

Intel OverDrive ODPR486DX-33 w/o Cooler


ODPR486DX-33 SZ698 C2522231 B1 INTEL (M) (c) 1989	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

Intel OverDrive ODPR486DX-33 (V3.0)


ODPR486DX-33 C4050331 SZ878 V3.0 (M)(C)1989 1992	8345591GCB A4 EE 04

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 05/1994
L1 Cache:	8 KB
CPU Code:	i486 ODPR P4T
Intel S-Spec:	SZ878
Package Type:	Ceramic PGA-168
Socket:	1/2/3

i486 OverDrive New Naming Scheme

Intel OverDrive DX2ODP50


	BOXDX2ODP50, SZ932

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

Intel OverDrive DX2ODP66 (V4.0)


DX2ODP66 C4500207 SZ933 V4.0 INTEL (M) (c) '89 '92	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):

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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 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

Intel OverDrive DX2ODPR66 (V3.0)


DX2ODPR66 C4370275 SZ904 V3.0 (M)(C)1989 1992	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

Intel OverDrive DX2ODPR66 (V4.0)


DX2ODPR66 C5240780 SZ935 V4.0 INTEL (M)(C)'89'92

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

Intel OverDrive DX4ODP75


BOXDX4ODP75

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

Intel OverDrive DX4ODPR75 (V1.1)


DX4ODPR75 C5291151 SZ958 V1.1 INTEL(M)(C) '89'93	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

Intel OverDrive DX4ODPR100 (V1.0)


DX4ODPR100 C43507058 SZ926 V1.0 INTEL(M)(C) '89'93	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

Intel OverDrive DX4ODPR100 (V1.1)


DX4ODPR100 C5040328 SZ959 V1.1 INTEL(M)(C) '89'93	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