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Please help me identify this mystery i486

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First post, by LChackr

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A couple years ago I bought a small lot of interesting/uncommon CPUs from someone selling their collection. All of the other chips were easy to identify, but this one is a bit odd. Does anyone have an idea of what it might be? (As in, what S/Q-spec/version it might be.)

Here are a few observations:

- The CPU came with a note saying it was a 486/66.

- The heatsink is the same style as the type that appears on Intel Overdrive chips. It's epoxied to the ceramic, aligned precisely, and looks to be factory installed.

- The spires on the heatsink are taller than other 486/66 Overdrive chips I've seen. It's similar, but still different than the i486DX4 heatsinks too.

- The plate on the top of the heatsink, where the chip identification information normally sits, is totally blank.

- The very top of the Intel logo is visible under the attached heatsink. It looks as if the ceramic was marked at the factory, then covered.

- The bottom of the chip is marked more consistently with a standard 486DX2/66, not like an Overdrive. At least, from what I can compare based on my collection and the pictures I've found of other i486s.

Pics are attached. Thanks!

Reply 2 of 4, by Horun

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It looks nearly Identical to one of my Intel DX2-66 and like the one at CPU-World, just missing the badge that would be glued to the plate (or got glued upside down ?)

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 3 of 4, by LChackr

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Probably some aftermarket cooler that have been glued on there ?

It's possible, but it doesn't look like a generic aftermarket cooler. I have a number of chips with the typical 486 heat sinks but they are all nondescript. This one is so close to the ones Intel uses form the factory that it made me wonder.

It looks nearly Identical to one of my Intel DX2-66 and like the one at CPU-World, just missing the badge that would be glued to the plate (or got glued upside down ?)

Yeah, it looks A LOT like that chip. I wish mine were that beautiful blue though. 😀

I don't know if it's an SX759 though.

Reply 4 of 4, by Horun

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LChackr wrote on 2020-05-17, 23:49:
It's possible, but it doesn't look like a generic aftermarket cooler. I have a number of chips with the typical 486 heat sinks […]
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Probably some aftermarket cooler that have been glued on there ?

It's possible, but it doesn't look like a generic aftermarket cooler. I have a number of chips with the typical 486 heat sinks but they are all nondescript. This one is so close to the ones Intel uses form the factory that it made me wonder.

It looks nearly Identical to one of my Intel DX2-66 and like the one at CPU-World, just missing the badge that would be glued to the plate (or got glued upside down ?)

Yeah, it looks A LOT like that chip. I wish mine were that beautiful blue though. 😀

I don't know if it's an SX759 though.

I agree the blue is beautiful, mine is brown like an ODP. Too bad Intel did not publicly catalog the back numbers so we could look them up. Maybe someone like cpushack at cpu-world could help you (he is also a member here), they do have a forum.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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