Date: Wed, 05 Mar 1997 14:14:17 -0800 From: Erich Boleyn <erich@uruk.org> To: Steve Passe <smp@csn.net> Cc: freebsd-smp@freebsd.org Subject: Re: P6 MB recommendations Message-ID: <E0w2Owz-0003Zd-00@uruk.org> In-Reply-To: Your message of "Wed, 05 Mar 1997 12:36:47 MST." <199703051936.MAA05910@clem.systemsix.com>
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Steve Passe <smp@csn.net> wrote: > be aware that there is an outside chance that a CPU purchased 6 months from > now may not be able to run with a current stepping. Intel says that you > should always run dual CPUs of the same stepping. this used to be a > requirement because of differences ion timings of the APICs and ??? > It is my personnal understanding that it is no longer a problem, but > you should understand that there is a slight chance of incompatibility... As I understand it, the problems were with the Pentium dual-CPU configurations, which had a bunch of incompatible fixes to the APIC logic over it's lifetime. The later ones are pretty worry-free. The Pentium Pro setups were designed and tested up to 4-CPU early on, and the protocol was stabilized pretty well. Ideally, 2 CPUs of the same stepping is good, but I'm not sure it matters that much as long as they're of the same model for the Pentium Pro. However, I don't think the next revision of the Pentium Pro (the one with MMX) is supposed to be pinout-compatible. The existing version will probably continue to be available. Check with Intel for details. -- Erich Stefan Boleyn \_ E-mail (preferred): <erich@uruk.org> Mad Genius wanna-be, CyberMuffin \__ (finger me for other stats) Web: http://www.uruk.org/~erich/ Motto: "I'll live forever or die trying"
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