Installing 2nd CPU on SMP board
Glenn Dawson
glenn at antimatter.net
Wed Oct 19 17:13:23 PDT 2005
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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