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Date: Wed, 19 Oct 2005 16:12:32 -0700
To: kurt.buff@gmail.com, Charles Swiger <cswiger@mac.com>
From: Glenn Dawson <glenn@antimatter.net>
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Cc: Doug Poland <doug@polands.org>, questions@freebsd.org
Subject: Re: Installing 2nd CPU on SMP board
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At 03:57 PM 10/19/2005, Kurt Buff wrote:
>Charles Swiger wrote:
> > On Oct 19, 2005, at 4:44 PM, Doug Poland wrote:
> >
> >> I've inherited an SMP machine for which I've no documentation and  don't
> >> have convenient access to the hardware itself.  The computer has a
> >> single Xeon 2.8GHz CPU and I'd like to purchase another CPU.  Question
> >> is, can I simply match another Xeon of the same speed and expect it to
> >> work?
> >
> >
> > 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.
> >
> >> If I need more info, will dmesg(8) tell me what I need to know?
> >
> >
> > If you understand how to translate the dmesg display into processor
> > steppings, sure.

It's better to match the sSpec numbers...those include the stepping, 
and not all processors of the same stepping have the same sSpec.

-Glenn

> >
> > See pages 16-17 of:
> >
> > http://download.intel.com/design/Xeon/specupdt/24967849.pdf
>
>
>Ya know, if you have the money, it's probably just faster/easier to buy
>two new matching CPUs that are known to work with the board, strip out
>the old one and put the new ones in.
>
>Just a (lazy) thought...
>
>Kurt
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