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Date: Wed, 19 Oct 2005 17:10:47 -0700
To: Chuck Swiger <cswiger@mac.com>
From: Glenn Dawson <glenn@antimatter.net>
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Cc: Doug Poland <doug@polands.org>, kurt.buff@gmail.com, questions@freebsd.org
Subject: Re: Installing 2nd CPU on SMP board
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At 04:48 PM 10/19/2005, Chuck Swiger wrote:
>Glenn Dawson wrote:
>>At 03:57 PM 10/19/2005, Kurt Buff wrote:
>[ ... ]
>>>>You want to get the same speed, FSB, and family number of Xeon, and  it
>>>>is preferable to get the same stepping number if possible.
>>It's better to match the sSpec numbers...those include the 
>>stepping, and not all processors of the same stepping have the same sSpec.
>
>Intel's documentation for dual-proc and multiproc compatibility is 
>based on family ID and stepping #, not on the s-spec #.
>
>The family ID is akin to a major version number, and the stepping is 
>akin to a minor version number.  You can get the family ID and 
>stepping from dmesg, you cannot get the sSpec number via that 
>directly.  For example:
>
>CPU: Intel(R) Xeon(TM) CPU 3.00GHz (2992.71-MHz 686-class CPU)
>   Origin = "GenuineIntel"  Id = 0xf43  Stepping = 3
>Features=0xbfebfbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,CLFLUSH,DTS,ACPI,MMX,FXSR,SSE,SSE2,SS,HTT,TM,PBE>
>   Hyperthreading: 2 logical CPUs
>
>If you hunt down the right Xeon document:
>
>http://download.intel.com/design/Xeon/specupdt/30240216.pdf
>
>...and search for "0xf43", you get:

The point I was trying to make is that if you use the sSpec number, 
you can't go wrong.

0xf43 leads to sSpec SL7ZF _and_ SL8ZQ

-Glenn


>S-Spec CoreStepping CPUID CoreFreq FSB L2_cache ....
>SL7ZF  N0           0F43h 3        800 2 MB     604-pin micro-PGA
>
>--
>-Chuck
>
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