From owner-freebsd-smp Mon Jun 29 12:38:02 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id MAA22503 for freebsd-smp-outgoing; Mon, 29 Jun 1998 12:38:02 -0700 (PDT) (envelope-from owner-freebsd-smp@FreeBSD.ORG) Received: from mail.atipa.com (altrox.atipa.com [208.128.22.34]) by hub.freebsd.org (8.8.8/8.8.8) with SMTP id MAA22471 for ; Mon, 29 Jun 1998 12:37:53 -0700 (PDT) (envelope-from freebsd@atipa.com) Received: (qmail 7896 invoked by uid 1017); 29 Jun 1998 18:34:50 -0000 Date: Mon, 29 Jun 1998 12:34:50 -0600 (MDT) From: Atipa To: Niall Smart cc: freebsd-smp@FreeBSD.ORG Subject: Re: PPro vs PII In-Reply-To: <199806291334.OAA00515@indigo.ie> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-smp@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Mon, 29 Jun 1998, Niall Smart wrote: > On Jun 28, 8:38pm, Atipa wrote: > } Subject: Re: PPro vs PII > > > > The P2 will smoke it. Better yet, go up to 350 or 400MHz, then you can > > utilize 100MHz system bus. > > I was thinking of trying 300Mhz P2s at 100Mhz system bus using the hack > described at www.sysdoc.pair.com. Good plan, but don't let your vendor know. :) I maintain an anti-overclocking position at all times, because I think the headaches (for yourself and your vendors) exceed the performance gain. I only overclock (temporarily) game machines and VGA cards in said machines. No way would I even consider oc'ing a server... > > Since the P2 has DIB (dual independent bus) for the L2 cache, higher clock > > rates, and much faster DRAM access, you'll definitely notice the > > difference. Pros are at the end of their lifecycle, and will be hard to > > support. > > But the P2 has a much slower cache clock speed, what is a DIB? Not really. On a clock for clock ratio, yes. But since the P2 clock rates are so much higher, the cache difference becomes less noticable. A P2-350 caches at 175, compared to 200 for a Pro. The DIB on the P2 allows higher hit rates and higher bandwidth between the L1, L2, and CPU. > And how is the DRAM access faster if both the P2 and PPro use a 66Mhz > system bus? The P2's can use a 440BX chipset, which supports 100MHz Sync DRAM (7ns), while the best production Pro chipset is the 440NX (Natoma), which supports only 66MHz EDO (async) DRAM at 60ns. EDO is 200MB/sec, while 100MHz SDRAM is over 500MB/sec. Kevin To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-smp" in the body of the message