That's still a regular rundown of the mill 486DX... You must be confusing with the Pentium Overdrive which IIRC has a modified Pentium core on a 486 socket.

Edit: Woops not exactly a regular 486... These were made to fit in 486 motherboards that had upgrade sockets.. Think of it as one of these 486 motherboard upgrade chips.

So is this just an upgrade for an Intel 486sx CPU ?

[EDIT]
Not quite run-of-the-mill 486s. There were some difference between a standard i486, and their Overdrive counterpart; per Wikipedia:

https://en.wikipedia.org/wiki/Intel_80486_OverDrive

ntel's i486 OverDrive processors are a category of various Intel 80486s that were produced with the designated purpose of being used to upgrade personal computers. The OverDrives typically possessed qualities different from 'standard' i486s with the same speed steppings. Those included built-in voltage regulators, different pin-outs, write-back cache instead of write-through cache, built-in heatsinks, and fanless operation — features that made them more able to work where an ordinary edition of a particular model would not.

A Pentium Overdrive for the 486 platform will look like this:

Some more info: https://en.m.wikipedia.org/wiki/Intel_80486_OverDrive
This particular one will fit into an Overdrive socket that has 169 pins.

http://www.cpu-world.com/sspec/SZ/SZ802.html

Basically a DX2-66

This is the one, to be exact:
http://www.cpu-world.com/CPUs/80486u/Intel-ODP486DX-33.html

Indeed, an upgrade for a 486DX33 system to a DX2-66.

gbeirn wrote:

http://www.cpu-world.com/sspec/SZ/SZ802.html

Basically a DX2-66

Wrong. A 486ODP is a DX2-66 with the extra pin (FC-PGA169).
It should be placed in an overdrive socket. Question: Is this the same socket used for the 487 SX?
It may not work in every socket 1.

There also exists 486ODPR (R for Replacement) which is a DX2-66 without the extra pin (FC-PGA168).

Note that Intel has changed the label from 486ODP33 to 486ODP66 and 486ODPR33 to 486ODPR66 somewhen.

486 Overdrives operate with 5 Volt and do not require motherboards supporting 3.3 Volt.

Scali wrote:

This is the one, to be exact:
http://www.cpu-world.com/CPUs/80486u/Intel-ODP486DX-33.html

Indeed, an upgrade for a 486DX33 system to a DX2-66.

Great !
I perfect upgrade for my IBM Value point 486sx-33mhz.

Yeah, that's one of the most pointless Overdrive (the 169 pin one has some use), I have one ...
I have no clue why it exists, it's just a 486DX2 66

Deksor wrote:

Yeah, that's one of the most pointless Overdrive (the 169 pin one has some use), I have one ...
I have no clue why it exists, it's just a 486DX2 66

I think the point is that it has a heatsink mounted to it. Regular DX2-66 CPUs came without a heatsink, putting the responsibility for proper cooling with the OEM.
The OverDrive came with a suitable heatsink, so it was a drop-in replacement for any DX33 machine, which did not require a heatsink at all, so the machine would not have any special design for cooling the CPU.
I wouldn't be surprised if these OverDrive CPUs were cherry-picked by Intel for lower power usage, to minimize heat dissipation, where regular DX2-66 could be the more powerhungry ones.

Deksor wrote:

Yeah, that's one of the most pointless Overdrive (the 169 pin one has some use), I have one ...
I have no clue why it exists, it's just a 486DX2 66

Marketing.

They've made the FCPGA-169 socket ODP cheaper than the DX2 because you still need the already paid SX or DX in your FCPGA-168 socket.
It's because Intel did not want you to install the Overdrive and sell the old SX or DX for use in another motherboard.

Later they've made FCPGA-168 socket ODPRs for motherboards that do not have a FCPGA-169 socket.

Deksor wrote:

Yeah, that's one of the most pointless Overdrive (the 169 pin one has some use), I have one ...
I have no clue why it exists, it's just a 486DX2 66

Well going from a 468sx-33 to a 486dx-66 is not exactly pointless.
Not only do you get a speed bump but a mathco processor too.

Scali wrote:

I think the point is that it has a heatsink mounted to it. Regular DX2-66 CPUs came without a heatsink, putting the responsibili […]
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Deksor wrote:

Yeah, that's one of the most pointless Overdrive (the 169 pin one has some use), I have one ...
I have no clue why it exists, it's just a 486DX2 66

I think the point is that it has a heatsink mounted to it. Regular DX2-66 CPUs came without a heatsink, putting the responsibility for proper cooling with the OEM.
The OverDrive came with a suitable heatsink, so it was a drop-in replacement for any DX33 machine, which did not require a heatsink at all, so the machine would not have any special design for cooling the CPU.
I wouldn't be surprised if these OverDrive CPUs were cherry-picked by Intel for lower power usage, to minimize heat dissipation, where regular DX2-66 could be the more powerhungry ones.

The "drop-in" part is the keyword here. AFAIK, it is exactly drop-in - as in - no jumper change or anything necessary.

http://chookman.id.au/cpu/processors/Overdriv … /overdrive.html

I thought these were the old 386 to 486 chips, but they are not. The website makes clear the numbering system is very confusing. Early ones were labeled with what they were upgrading, not what they actually were.

The 1989 date is what threw me off. Must be from the date of the original 486?

Cobra42898 wrote:

I thought these were the old 386 to 486 chips, but they are not.

No, they used the name RapidCAD for those: https://en.wikipedia.org/wiki/RapidCAD

Cobra42898 wrote:

The 1989 date is what threw me off. Must be from the date of the original 486?

Yes, probably the copyright date of the original 486 architecture.