From owner-freebsd-smp Tue Apr 29 00:13:33 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id AAA01108 for smp-outgoing; Tue, 29 Apr 1997 00:13:33 -0700 (PDT) Received: from critter.dk.tfs.com (phk.cybercity.dk [195.8.129.17]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id AAA01103; Tue, 29 Apr 1997 00:13:25 -0700 (PDT) Received: from critter (localhost [127.0.0.1]) by critter.dk.tfs.com (8.8.5/8.8.5) with ESMTP id JAA01513; Tue, 29 Apr 1997 09:12:22 +0200 (CEST) To: brownie@earthling.net cc: Poul-Henning Kamp , smp@freebsd.org From: Poul-Henning Kamp Subject: Re: Quad Pro 150 motherboard? In-reply-to: Your message of "Mon, 28 Apr 1997 23:12:08 PDT." <33659138.D27@earthling.net> Date: Tue, 29 Apr 1997 09:12:21 +0200 Message-ID: <1511.862297941@critter> Sender: owner-smp@freebsd.org X-Loop: FreeBSD.org Precedence: bulk In message <33659138.D27@earthling.net>, Chris Browning writes: >> >The PPro's are stackable without additional electronics external >> >to the processor. This makes it a *lot* easier to do multiple >> >CPU's up to large numbers. >> >> The original design was for up to four PP's to be stackable. >> Unfortunately it transpired to not be the case (for reasons >> for signal integrity I belive, and therefore 4*PP cards have >> a number of buffers more than 2*PP cards. > >What are you talking about here? I have never heard anything about >having to add buffers for > 2 PPP designs. Can you point to a >PPP errata for this? I think someone has misinformed you. > >Chris Well, I talked to a couple of people who did speak for Intel, they said that it was close to impossible to get four PP to work on a "plain" PC motherboard, you would have to do the daughterboard+buffer thing... The reasons stated was "termal, electrical & practical"... -- Poul-Henning Kamp | phk@FreeBSD.ORG FreeBSD Core-team. http://www.freebsd.org/~phk | phk@login.dknet.dk Private mailbox. whois: [PHK] | phk@tfs.com TRW Financial Systems, Inc. Power and ignorance is a disgusting cocktail.