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TheRealZago
Joined: 27 Jan 2020
Posts: 3
Location: Northern Italy
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 Posted: Tue Jan 28, 2020 5:24 pm Post subject: Getting S-Spec for unmarked Pentium 4 |
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Hi, guys.
I just got a box full of random CPUs and one stood up: the markings on the lid were completely gone. The only thing I knew was the mPGA478 socket.
So, I quickly rigged up a 478 test bench and fired it up with said CPU. Turns out it's a Northwood Pentium 4, rated at 2.4 GHz with a 533 MHz bus and 512 kB cache, CPUID F27. That's enough info for normal use, but I'd like to know more about this chip.
It's very easy to get the specs from the S-Spec code, but reversing the process is quite difficult, mainly for the number of Intel chips with the same identical specs and CPUID.
Is there a way to get the correct S-Spec just from what comes up with a CPUID dump?
Any advice will be appreciated!
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wren4777
Joined: 13 Dec 2016
Posts: 571
Location: Litija, Slovenia
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| Posted: Tue Jan 28, 2020 7:21 pm Post subject: |
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Are the markings gone because the IHS has been lapped, or does the surface finish look untouched? If you open up CPU-Z or similar, does it identify as an ES, or retail part?
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TheRealZago
Joined: 27 Jan 2020
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Location: Northern Italy
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| Posted: Wed Jan 29, 2020 7:11 am Post subject: |
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| linuxfanatic wrote: | | Are the markings gone because the IHS has been lapped, or does the surface finish look untouched? |
I think the previous owner tried to clean it using something slightly abrasive and it removed the etched markings.
| linuxfanatic wrote: | | If you open up CPU-Z or similar, does it identify as an ES, or retail part? |
Both CPU-Z and AIDA64 see it as a retail CPU, only new detail is stepping C1. I tried with UBCD and the included Intel Processor Identification Utility detects it as a Pentium 4 "2.40B GHz". I'm not sure about the B part: I know P4s came with an A suffix if they were Northwood core but shared the same frequency as a Willamette (I have a P4 2A to confirm that) and P3s had a B suffix if they were rated for 133FSB operations. I'm not sure about the meaning of this B. |
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wren4777
Joined: 13 Dec 2016
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Location: Litija, Slovenia
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Wed Jan 29, 2020 7:54 am Post subject: |
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Generally there are no known ways to distinguish between s-specs within one cpuid/stepping by software.
Your is one of the four, SL6DV, SL6EF, SL6RZ, SL6SH. |
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debs3759
Joined: 18 Jan 2006
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Location: Northampton, Divided Kingdom
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TheRealZago
Joined: 27 Jan 2020
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Location: Northern Italy
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| Posted: Wed Jan 29, 2020 8:48 am Post subject: |
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Alright, guess it will remain a mystery...
Now, a question: why did Intel market all those CPUs under different S-Spec codes, even if they were the same part, same stepping and same everything? What were they trying to differentiate? |
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crazybubba64
Joined: 03 Jul 2018
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Location: WI, USA
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| Posted: Wed Jan 29, 2020 11:42 am Post subject: |
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| TheRealZago wrote: | Alright, guess it will remain a mystery...
Now, a question: why did Intel market all those CPUs under different S-Spec codes, even if they were the same part, same stepping and same everything? What were they trying to differentiate? |
Some were special parts for specific OEMs.
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debs3759
Joined: 18 Jan 2006
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| Posted: Wed Jan 29, 2020 11:49 am Post subject: |
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Also some s-specs are functionally the same as others, but have had extra testing for different environments.
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