Installing 2nd CPU on SMP board
Chuck Swiger
cswiger at mac.com
Wed Oct 19 16:48:32 PDT 2005
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:
S-Spec CoreStepping CPUID CoreFreq FSB L2_cache ....
SL7ZF N0 0F43h 3 800 2 MB 604-pin micro-PGA
--
-Chuck
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