The Kingston module is most likely an AMD 5x86-133. There are several apps that can tell you for sure. CPU-Z, SIV and HWInfo all have sticky threads in here relating to versions that should work on your hardware.

The Turbo chip is most likely a 5x86-133 working in WriteTrough mode.

tour86rocker wrote on 2021-01-31, 04:48:

I'm now trying to identify the microprocessor in the second Deskpro and that is difficult. On top there is a heat sink and on the bottom, the numbers don't seem to turn up anything on Google.

I just noticed a faint marking on a gray metallic band that holds the heat sink onto this microprocessor. It seems to say "IERC-S002" (The 'I' and 'E' are faint). I found exactly two results in Google for this and neither really tells me what I'm looking at. Here is the more helpful of the two, which doesn't really say much. https://www.radiomuseum.org/tubes/tube_52513924.html

I think this is probably an Intel i486 of some sort because the bottom of it looks just like this and it's supposed to be a 486 machine: http://www.chipdb.org/img-intel-a80486dx-50-sx547-7263.htm

Those pictures don't even remotely look like a Kingston Turbochip:

That does sort of raise the question: what leads you to believe that there's a Kingston CPU in that system?

Can we have pictures of the actual CPUs in question so we can do an educated guess? Right now we are shooting blanks in the dark so to speak.

Certainly sounds like a Kingston TurboChip. Not an uncommon upgrade to 486 systems back in the day. The buyer could have just reverted the system back to a 486DX66 if they wanted.

I can tell I was unclear. I don't have any questions about my Kingston Turbochip. I've already positively identified that one, I shouldn't have mentioned it. That was the first machine.

"I'm now trying to identify the microprocessor in the second Deskpro and that is difficult". It looks just like this: https://www.radiomuseum.org/tubes/tube_52513924.html

The heatsink says "IERC-S002" just like you see at that link and the other side says "C2224643CA" then on the next line "A4" and on a third line, "AB" and then after an indentation "32". I get no search results for "C2224643CA".

IERC S002 is the part number of the heatsink, not the CPU
http://acksupply.com/catalog/heatshrk.pdf
It is a 486 CPU heatsink so that makes sense.

The C2224643CA is a production code, it tells that this CPU was made in 1992 week 22 but the rest is simply a lot code identifier. Without internal Intel documentation you will not find out what the CPU type is.

This BTW does identify it as an Intel CPU. The model number is on the top side under the heatsink that is most likely, glued on with thermal-conductive glue.

Does the bios identify the part when the computer boots or at the configuration menu?
Are you able to run any of the tools here: https://www.philscomputerlab.com/dos-benchmark-pack.html or here: https://www.cpuid.com/softwares/cpu-z.html ?

douglar wrote on 2021-02-02, 18:25:

Does the bios identify the part when the computer boots or at the configuration menu?
Are you able to run any of the tools here: https://www.philscomputerlab.com/dos-benchmark-pack.html or here: https://www.cpuid.com/softwares/cpu-z.html ?

No to the first question, but the benchmark tool worked adequately. There was a missing Batch file for some reason, but the executable was there.

Thanks, all. I actually posted a follow up question here today if you know what to do: Steps for replacing 486 board's microprocessor?