Date: Wed, 19 Oct 2005 18:52:19 -0500 From: Doug Poland <doug@polands.org> To: Chuck Swiger <cswiger@mac.com> Cc: kurt.buff@gmail.com, questions@freebsd.org, Glenn Dawson <glenn@antimatter.net> Subject: Re: Installing 2nd CPU on SMP board Message-ID: <20051019235218.GB47568@polands.org> In-Reply-To: <4356DB52.9030800@mac.com> 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> <4356DB52.9030800@mac.com>
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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
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