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red-ray
Joined: 18 Jun 2019
Posts: 46
Location: England
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 Posted: Thu Apr 10, 2025 6:01 am Post subject: Intel i486 DX2 SX807 CPUs, two variants? |
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| I have recently been adding the i486 S-Specs panel to SIV and there may be two variants of the Intel i486 DX2 SX807. Looking on this site then the SX807 CPUID is listed as 0435 as does https://www.ardent-tool.com/CPU/486_Step.html, but I have a SX807 and it's 0436! So there seem to be two variants. If you have a i486 DX2 SX807 please will you post what it's stepping is. |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Thu Apr 10, 2025 6:14 am Post subject: |
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This is fake, likely from DX2-50 SX954.
Font looks wrong even on this low quality photo, and copyright years on the back are not the same as on the front. |
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red-ray
Joined: 18 Jun 2019
Posts: 46
Location: England
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| Posted: Thu Apr 10, 2025 6:50 am Post subject: Why would they not have used SX955 ? |
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| frag_ wrote: | | Font looks wrong even on this low quality photo, and copyright years on the back are not the same as on the front. |
Thank you, here are some better photos, I was being lazy and used my web-cam for the initial ones.
Assuming it's a fake then has then why would they not have used SX955 which has the same CPUID and is also a DX2/66 ?
It runs fine @ 66 MHz and the system will post @ 80 MHz, but Windows NT don't boot, might a SX955 run @ 80 MHz?
Last edited by red-ray on Thu Apr 10, 2025 7:09 am; edited 1 time in total |
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frag_
Joined: 17 Nov 2008
Posts: 4015
Location: Estonia
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| Posted: Thu Apr 10, 2025 6:56 am Post subject: |
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| The entire point of this kind of faking was to sold them as more expensive model, so conversion 50 -> 66 was widespread, and making 66 from 66 was not profitable of course. |
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red-ray
Joined: 18 Jun 2019
Posts: 46
Location: England
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| Posted: Thu Apr 10, 2025 7:12 am Post subject: I meant SX954 to SX955 |
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| frag_ wrote: | | The entire point of this kind of faking was to sell them as more expensive model, so conversion 50 -> 66 was widespread, and making 66 from 66 was not profitable of course. |
I meant SX954 to SX955, maybe a SX807 cost more than a SX955 |
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red-ray
Joined: 18 Jun 2019
Posts: 46
Location: England
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| Posted: Thu Apr 10, 2025 7:53 am Post subject: Fake SX954? |
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| I have updated my panel to say Fake SX954? and noticed that both SX954 + SX955 support L1 cache WB mode. AFAIK the SX807 does not and wonder what would happen with my "SX807", my MB doesn't support L1 cache WB so I can't check. |
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CPUShack
Joined: 16 Jun 2003
Posts: 34258
Location: State of Jefferson, USA
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rjluna2
Joined: 27 Oct 2014
Posts: 1302
Location: Hiram, GA, USA
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| Posted: Fri Apr 11, 2025 9:13 am Post subject: |
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Sounds like a minor update that has escaped to the wild  |
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