From owner-freebsd-hardware Tue Feb 25 15:16:05 1997 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.5/8.8.5) id PAA23217 for hardware-outgoing; Tue, 25 Feb 1997 15:16:05 -0800 (PST) Received: from mail12.digital.com (mail12.digital.com [192.208.46.20]) by freefall.freebsd.org (8.8.5/8.8.5) with ESMTP id PAA23191 for ; Tue, 25 Feb 1997 15:16:00 -0800 (PST) Received: from muggsy.lkg.dec.com by mail12.digital.com (8.7.5/UNX 1.5/1.0/WV) id SAA15169; Tue, 25 Feb 1997 18:06:10 -0500 (EST) Received: from usr602.zko.dec.com by muggsy.lkg.dec.com (5.65/DEC-Ultrix/4.3) with SMTP id AA25703; Tue, 25 Feb 1997 18:06:07 -0500 Message-Id: <3.0.32.19691231190000.0069517c@netrix.lkg.dec.com> X-Sender: popmatt@netrix.lkg.dec.com X-Mailer: Windows Eudora Pro Version 3.0 Demo (32) Date: Tue, 25 Feb 1997 18:06:18 -0500 To: "Jin Guojun[ITG]" From: Matt Thomas Subject: Re: Memory speed of P6-200 (256k) Cc: freebsd-hardware@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk At 12:48 PM 2/25/97 -0800, Jin Guojun[ITG] wrote: >The PCI is a 64-bit wide bus. The maxmimum memory speed you can get from >this bus is 1000000000 * 8 / 60ns = 133333333 Bytes/sec (no inteleave). That is wrong. The PCI is typically a 32-bit wide bus running @ up to 33Mhz. 4 bytes * 33Mhz = maximum of 132MB/s assuming almost perfect bursting and no wait states. 64 bit PCI doubles that maximum to 265MB/s. -- Matt Thomas Internet: matt@3am-software.com 3am Software Foundry WWW URL: http://www.3am-software.com/bio/matt.html Westford, MA Disclaimer: I disavow all knowledge of this message