Date: Wed, 19 Oct 2005 19:48:34 -0400 From: Chuck Swiger <cswiger@mac.com> To: Glenn Dawson <glenn@antimatter.net> Cc: Doug Poland <doug@polands.org>, kurt.buff@gmail.com, questions@freebsd.org Subject: Re: Installing 2nd CPU on SMP board Message-ID: <4356DB52.9030800@mac.com> In-Reply-To: <6.2.3.4.2.20051019161158.05ff9160@cobalt.antimatter.net> References: <20051019204428.GB46703@polands.org> <7BF2FC41-83C1-4E8C-8201-846783762B7B@mac.com> <4356CF56.2090106@gmail.com> <6.2.3.4.2.20051019161158.05ff9160@cobalt.antimatter.net>
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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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