Identifying 120 MHz Pentium manufacturing process

[Birdman.]

Hello!

According to Wikipedia all 120 MHz Pentiums should have 0.35 micron P54CQS dies inside, but both two opened ones I've found online seem to have the good old 0.6 micron P54C dies inside. Does Wikipedia have incorrect information there? The CPU World database lists both but doesn't specify how to identify the manufacturing process.

Thus, is there any way to know the manufacturing process and die type of 120 MHz Pentiums without opening the lid?

I'd like to know because I'd like to take a die shot of that P54CQS die without opening unnecessary chips.

[CPUShack]

It was made on both, depending on the sspec
you can see revisions here:
http://www.cpu-world.com/CPUs/Pentium/Intel-Pentium%20120%20-%20A80502120%20(A80502-120).html

[Birdman.]

I don't see any information about the dies of different sspec versions there, only core revision information. Does anyone know which core revisions are 0.35 micron P54CQS ones and which old 0.6 micron P54C ones? Are those cB1 (Q0776, SK110) and cC0 (SY062) core steppings the 0.35 micron ones because they aren't listed for 100 MHz version?

[Neon_WA]

0.6 micron >> B5, C2 & E0 steppings
0.35 micron >> cB1 & cC0

also worth to note.. CB1 & C2 are same core revision but on different manufacturing processes

[Birdman.]

Thank You!

I'll check the sspec of one such chip I have at the university today and take the die shot if it's 0.35 micron one. If the one I found is a 0.6 micron one, than I'll just have to hope that someone had a broken 0.35 micron one for die shot.

[Birdman.]

My chip is SY062, so that's 0.35 micron cC0 stepping! I'll have to open it now and take a die shot of P54CQS die. Thus, you can expect to see that die soon. I'm sorry that I didn't notice this earlier.

PS. I should get a P24T die tomorrow, so someone can then write some nice article comparing all the Pentium dies.

[Birdman.]

Now I don't understand anymore because the die inside my SY062 is smaller than the 0.6 micron P54C die of my 100 MHz SX963 and packaging is also different to match the smaller die size. Wasn't P54CQS supposed to have the same die size as P54C to use the same packaging?

I don't have HARDWARECOP's 133 MHz Pentium anymore, so I can't compare side by side with a P54CS die anymore, but I'll take die shot of my SY062 die soon. Anyway, my SY062 die looks similar to the P54CS die in 133 MHz SK106 (cB1 stepping). Are the cB1 and cC0 steppings then just the same P54CS dies used in 133+ MHz models and what is the stepping of that P54CQS then?

[H3nrik V!]

Reviving this subject, as I happen to sit here and look at the same stuff.

As far as I understand, P54C is 0,6u, P54CQS and P54CS are 0,35, thus the two latter I would suspect looking similar.

[bmn]

Has this been cleared up, are all P120s P54CQS with 0.35 core.

Reading Intel's spec and old Usenet posts I gather the early stepping (b5) uses the older P54C (p75-p100) pad ring package BUT the core is still .35 and the newer steppings intel just used P54CS with 120 printed on the chips.

I have a SX994 week 18 1995(c2 step). It can overclock to 200mhz on a super socket 7 motherboard (2x100fsb). The only adjustment i did was switching from VR voltage VRE, and a 1inch small socket-5 heatsink/fan. I don't think this would be possible if the core was using a 0.600nm process, that is why i'm now asking this.

By the way did ANY P120 stepping have the BF1 multiplier pin connected internally. Every spec I have tried is limited to 1.5 or 2x multiplier. It would have been cool to think you could but this chip in March 95 and clock it 66x3 200mhz, years before the P200 was released,