From owner-freebsd-hardware Mon Dec 15 09:10:26 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id JAA14263 for hardware-outgoing; Mon, 15 Dec 1997 09:10:26 -0800 (PST) (envelope-from owner-freebsd-hardware) Received: from praline.no.neosoft.com (praline.no.NeoSoft.COM [206.27.160.253]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id JAA14245 for ; Mon, 15 Dec 1997 09:10:21 -0800 (PST) (envelope-from caj@praline.no.neosoft.com) Received: (qmail 7664 invoked by uid 65524); 15 Dec 1997 17:10:09 -0000 Date: Mon, 15 Dec 1997 11:10:09 -0600 (CST) From: Craig Johnston To: Allan Alford cc: Tom , Marc Rassbach , freebsd-hardware@FreeBSD.ORG Subject: Re: Speed of the cards? was Re: SCSI card to choose In-Reply-To: <34946669.73A4@jump.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-hardware@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Sun, 14 Dec 1997, Allan Alford wrote: > > The way I understand it is this: > > PCI bus speed = 1/2 motherboard bus speed. Motherboard bus speed is the In most current implementations, yes. Actually the PCI bus need not be related to the mobo bus speed in any way, it can be asynchronous. > To my knowledge, Cyrix is the only CPU manufacturer currently active who > can support the 83MHz standard anyway. Because of their new chip, a Huh? Bus speed is meaningless to the CPU. If your chip will run at 83Mhz times whatever multiplier and the motherboard cooperates, there you go. There's no CPU support for bus speed. The CPU doesn't care if it's doing 83 * 2 or 66 * 2.5. Folks are overclocking Intel and AMD chips in the same fashion. I'm running my K5-166 at 83*1.5, BTW. My Matrox Millenium (not II) and Symbios 53c810 both handle the resulting 41.5 Mhz bus speed just fine, for whoever was curious. -Craig