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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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 Posted: Thu Apr 11, 2013 2:13 am Post subject: the original socket 5 Pentium |
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I have had a original print of a press release photo for the socket 5 Pentium for a while,
but it has had me confused why the pin arrangement was slightly different from known socket 5 Pentiums 
while searching info on early socket 5 Pentiums I came across the thread that included bottom pics of the the P54CM50-75
manufactured week 43 1993 http://www.cpu-world.com/forum/viewtopic.php?t=3076
Apart from my press release picture this is the only example I have seen in this configuration.
As socket 5s from week 46 had already changed to the standard pin layout
I was surprised over the 7 years since it was posted.. no one mentioned the unusual pin layout 
Also I would expect that Q033 P54CM50-75 will have a CPUid of 520 like Q0475, Q0519, Q0520 & P90 MS
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Neon_WA
Joined: 08 Nov 2008
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Location: Margaret River, West Australia
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| Posted: Thu Apr 11, 2013 8:15 pm Post subject: Re: the original socket 5 Pentium |
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| Neon_WA wrote: | | Also I would expect that Q033 P54CM50-75 will have a CPUid of 520 like Q0475, Q0519, Q0520 & P90 MS |
Actually I need to expand on that
Seeing the part number is P54CM50-75 the CPUid can only be 2520 and not 0520
as P54CM code name is used for dual processor only Pentiums
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gshv
Joined: 01 Feb 2003
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Location: Fairfax, VA USA
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| Posted: Thu Apr 11, 2013 10:34 pm Post subject: |
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Is it possible that Intel planned to run SMP-enabled Pentiums on modified socket 5? Since the P54CM Pentium couldn't fit desktop boards, they could charge more for it and for the boards.
Unrelated observation: forum's picture upload feature proved to be very useful...
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CPUShack
Joined: 16 Jun 2003
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| Posted: Thu Apr 11, 2013 10:45 pm Post subject: |
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Perhaps since the P54CM was meant to be the secondary processor only, they made it have a diff pinout, so that there was no confusion over which CPU went in which socket
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Neon_WA
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gg1978
Joined: 31 Jul 2012
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| Posted: Fri Apr 12, 2013 1:09 pm Post subject: |
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| I thought Socket 5 had SMP in any event, though SMP pentiums were rather uncommon.. |
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Neon_WA
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| Posted: Fri Apr 12, 2013 7:34 pm Post subject: |
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| gg1978 wrote: | | I thought Socket 5 had SMP in any event, though SMP pentiums were rather uncommon.. |
The technical aspects are a bit over my under-standing but there was different SMP Pentium systems
A) 2 or 4 DP/MP tested P54C Pentiums running on their own bus
B) 2 P54C Pentiums running on the same processor bus
C) A P54C & P54CM running on the same processor bus (The P54C being the primary processor)
Each type of system had its pros & cons, but I suspect each type of system had its ideal use
Dont get confused.. a SMP enabled P54C Pentium was not the same as P54CM Pentium.
There was physical differences between the 2 (think mostly internal wiring)
interesting patent http://www.google.com/patents/US5579512
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Last edited by Neon_WA on Sat Apr 13, 2013 6:30 am; edited 1 time in total |
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CPUShack
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Neon_WA
Joined: 08 Nov 2008
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| Posted: Sun Apr 14, 2013 8:52 pm Post subject: |
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| gshv wrote: | | Is it possible that Intel planned to run SMP-enabled Pentiums on modified socket 5? Since the P54CM Pentium couldn't fit desktop boards, they could charge more for it and for the boards. |
This may have been Intel first thought.. but ended up not doing it.
YK gave some more info on his Q0520 but even thou has a newer FPO, from the die info it was packaged before the P54CM50-75 but still has standard pin arrangement.
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