To try and free the heatsink I would try leaving it in the freezer overnight and see if afterward the glue is brittle enough to either be twisted or levered free.

If it doesn’t pop off after freezing with a modicum of force then it’s not coming off.

Pino wrote on 2023-10-08, 15:13:

Hello everyone, […]
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Hello everyone,

I got this socket 3 CPU with a glued heatsink/fan that I can't remove.

Is there a way to know what it is by the inscriptions on the bottom? (see attached picture)

Any tip to un-glue the heatsink? I tried immersing it in isopropyl alcohol for a few minutes but it is still completely stuck.

Thanks in advance

What do you want to know about it?
It is an Intel DX2-66 with 99% probability

CoffeeOne wrote on 2023-10-08, 16:00:

Pino wrote on 2023-10-08, 15:13:

Hello everyone, […]
Show full quote

Hello everyone,

I got this socket 3 CPU with a glued heatsink/fan that I can't remove.

Is there a way to know what it is by the inscriptions on the bottom? (see attached picture)

Any tip to un-glue the heatsink? I tried immersing it in isopropyl alcohol for a few minutes but it is still completely stuck.

Thanks in advance

What do you want to know about it?
It is an Intel DX2-66 with 99% probability

Why are you so sure about that? All that the codes on the bottom can tell us is the date it was assembled.

If it helps I would also guess Intel 486 DX2 66MHz, since the bottom looks almost exactly like a SX750 I have, just different markings. The SX/DX33, DX4 and overdrives all look different:

A technique I've used successfully to remove stuck-on heatsinks is inserting a box cutter knife into the seam where the glue meets the heatsink, and then gentle tapping it with a mallet.

Thanks everyone for the tips, I will try to remove the heatsink.

If it doesn't work I will test it on one of my socket 3 motherboards with the jumpers set to DX2-66Mhz and 5V.

Pino wrote on 2023-10-08, 21:18:

Thanks everyone for the tips, I will try to remove the heatsink.

If it doesn't work I will test it on one of my socket 3 motherboards with the jumpers set to DX2-66Mhz and 5V.

Stop wasting time and let the heatsink where it is.

Yeah I say either a Intel DX2-66 or could be a Intel DX-33, if board set to X2-66 and it a DX-33 it will not boot stable....ohh and none of my AMD 486 have anything like that on the back if anything at all...
one of my Intel DX2-66 5v SL cpu's has i66 hard stamped on the back...and also has the A4 printed....

CoffeeOne wrote on 2023-10-08, 22:31:

Pino wrote on 2023-10-08, 21:18:

Thanks everyone for the tips, I will try to remove the heatsink.

If it doesn't work I will test it on one of my socket 3 motherboards with the jumpers set to DX2-66Mhz and 5V.

Stop wasting time and let the heatsink where it is.

A point worth considering as we also get a lot of threads concerning "How the heck do I get a heatsink to clip/clamp/stay-on a 486?" or bemoaning lack of decent 486 hsf solutions for sale etc etc. So in solving a perceived problem, there lurks another problem, that may have a less satisfactory solution, than just leaving it alone in the first place.

Horun wrote on 2023-10-09, 02:04:

Yeah I say either a Intel DX2-66 or could be a Intel DX-33, if board set to X2-66 and it a DX-33 it will not boot stable

Eh? DX/2 just has a hard-coded 2x multiplier, settings on the board should be exactly the same for a regular 5V WT DX/2 and the DX without the multiplier surely?

DX/50 ...at a guess

dionb wrote on 2023-10-09, 06:44:

Horun wrote on 2023-10-09, 02:04:

Yeah I say either a Intel DX2-66 or could be a Intel DX-33, if board set to X2-66 and it a DX-33 it will not boot stable

Eh? DX/2 just has a hard-coded 2x multiplier, settings on the board should be exactly the same for a regular 5V WT DX/2 and the DX without the multiplier surely?

Second that. I've recently played around with some of my 486 motherboards and for the 486DX-33 and 486DX2-66, the jumper settings are the same. Same applies to a 486DX-25 and 486DX2-50.

I haven't tried it, but rpocc posted a possible way to identify these CPUs with multimeter measurements across some of the pins:
Forensic test for a Socket 3 CPU using a multimeter

If you can do those measurements then it might match up with something on the spreadsheet they posted. It would need a lot more contributions added to the list before it could be taken as reliable though.

jesolo wrote on 2023-10-09, 07:13:

dionb wrote on 2023-10-09, 06:44:

Horun wrote on 2023-10-09, 02:04:

Yeah I say either a Intel DX2-66 or could be a Intel DX-33, if board set to X2-66 and it a DX-33 it will not boot stable

Eh? DX/2 just has a hard-coded 2x multiplier, settings on the board should be exactly the same for a regular 5V WT DX/2 and the DX without the multiplier surely?

Second that. I've recently played around with some of my 486 motherboards and for the 486DX-33 and 486DX2-66, the jumper settings are the same. Same applies to a 486DX-25 and 486DX2-50.

It's a lot easier to tell this on earlier 5V VLB and ISA boards with fewer jumpers. Later boards with multiple voltage settings, dx4 multipliers, wt/wb, SL, and AMD/Cyrix variations it gets a bit lost in the noise.

CoffeeOne wrote on 2023-10-08, 22:31:

Pino wrote on 2023-10-08, 21:18:

Thanks everyone for the tips, I will try to remove the heatsink.

If it doesn't work I will test it on one of my socket 3 motherboards with the jumpers set to DX2-66Mhz and 5V.

Stop wasting time and let the heatsink where it is.

It's a hobby, the whole point of this is to "waste time" and hopefully learn something in the process. 😀

I appreciate everyone's input, great discussion!!

BitWrangler wrote on 2023-10-09, 12:55:

jesolo wrote on 2023-10-09, 07:13:

dionb wrote on 2023-10-09, 06:44:

Eh? DX/2 just has a hard-coded 2x multiplier, settings on the board should be exactly the same for a regular 5V WT DX/2 and the DX without the multiplier surely?

Second that. I've recently played around with some of my 486 motherboards and for the 486DX-33 and 486DX2-66, the jumper settings are the same. Same applies to a 486DX-25 and 486DX2-50.

It's a lot easier to tell this on earlier 5V VLB and ISA boards with fewer jumpers. Later boards with multiple voltage settings, dx4 multipliers, wt/wb, SL, and AMD/Cyrix variations it gets a bit lost in the noise.

Agreed, there are a lot of jumpers to check but, you should find that the above statement holds true, provided that the DX2 parts are also the 5v WT CPU's (and not the later 3.3V variant). However, based on previous comments, my understanding is that we've established that the CPU is an Intel 5V WT part.

Pino wrote on 2023-10-09, 13:43:

CoffeeOne wrote on 2023-10-08, 22:31:

Pino wrote on 2023-10-08, 21:18:

Thanks everyone for the tips, I will try to remove the heatsink.

If it doesn't work I will test it on one of my socket 3 motherboards with the jumpers set to DX2-66Mhz and 5V.

Stop wasting time and let the heatsink where it is.

It's a hobby, the whole point of this is to "waste time" and hopefully learn something in the process. 😀

I appreciate everyone's input, great discussion!!

I agree.
Also I take it back.
Please remove the heatsink.
We have a lot of guesses already, I want to know who was right!

CoffeeOne wrote on 2023-10-09, 18:03:

I agree. Also I take it back. Please remove the heatsink. We have a lot of guesses already, I want to know who was right! […]
Show full quote

Pino wrote on 2023-10-09, 13:43:

CoffeeOne wrote on 2023-10-08, 22:31:

Stop wasting time and let the heatsink where it is.

It's a hobby, the whole point of this is to "waste time" and hopefully learn something in the process. 😀

I appreciate everyone's input, great discussion!!

I agree.
Also I take it back.
Please remove the heatsink.
We have a lot of guesses already, I want to know who was right!

It turns out that you were right! It is an Intel 486 DX2-66. 😀

Putting it into the freezer for a few minutes and using a knife / mallet did the trick, thank you all for the suggestions.

Pino wrote on 2023-10-09, 20:08:

CoffeeOne wrote on 2023-10-09, 18:03:

I agree. Also I take it back. Please remove the heatsink. We have a lot of guesses already, I want to know who was right! […]
Show full quote

Pino wrote on 2023-10-09, 13:43:

It's a hobby, the whole point of this is to "waste time" and hopefully learn something in the process. 😀

I appreciate everyone's input, great discussion!!

I agree.
Also I take it back.
Please remove the heatsink.
We have a lot of guesses already, I want to know who was right!

It turns out that you were right! It is an Intel 486 DX2-66. 😀

Putting it into the freezer for a few minutes and using a knife / mallet did the trick, thank you all for the suggestions.

I am always right, haha.
Can you please make a picture of the front side of the CPU?
I guess it is an early DX2 so a non SL-enhanced.