Installing 2nd CPU on SMP board

[Doug Poland]

On Wed, Oct 19, 2005 at 07:48:34PM -0400, 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:
> 
> S-Spec CoreStepping CPUID CoreFreq FSB L2_cache ....
> SL7ZF  N0           0F43h 3        800 2 MB     604-pin micro-PGA
> 
> 
Thanks for the tip.

-- 
Regards,
Doug