From owner-freebsd-hardware Sun Dec 8 14:15:31 1996 Return-Path: Received: (from root@localhost) by freefall.freebsd.org (8.8.4/8.8.4) id OAA26416 for hardware-outgoing; Sun, 8 Dec 1996 14:15:31 -0800 (PST) Received: from nexgen.HiWAAY.net (max1-169.HiWAAY.net [206.104.21.169]) by freefall.freebsd.org (8.8.4/8.8.4) with ESMTP id OAA26411 for ; Sun, 8 Dec 1996 14:15:27 -0800 (PST) Received: from nexgen.HiWAAY.net (localhost [127.0.0.1]) by nexgen.HiWAAY.net (8.7.6/8.7.3) with ESMTP id QAA22742; Sun, 8 Dec 1996 16:14:46 -0600 (CST) Message-Id: <199612082214.QAA22742@nexgen.HiWAAY.net> X-Mailer: exmh version 1.6.9 8/22/96 To: Michael Beckmann cc: hardware@freebsd.org Subject: Re: Tyan Tomcat ? 256 MB RAM ? DIMMs ? In-reply-to: Message from Michael Beckmann of "Sun, 08 Dec 1996 14:17:25 +0100." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Sun, 08 Dec 1996 16:14:45 -0600 From: David Kelly Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk Michael Beckmann writes: > > What do all you people do who want 256 MB RAM in their machines ? Do you > use 64 MB PS/2 SIMMs ? These are a bit hard to get, and more expensive than > the comparable number of 32 MB SIMMs. I also haven't found a source of 64 > MB EDO SIMMs at all, only FPM. IMHO, especially when you are dealing with 256M of RAM, buy FPM w/ parity. The possible performance boost of EDO isn't worth the loss of error checking. If you'll take a bit of a performance hit the Tomcat I will do error correction on its memory. Others have posted to the FreeBSD lists that it is very difficult to quantify a performance gain with EDO memory. Possibly EDO memory with parity would be the best of all worlds, and also the hardest to find. Think Micron might actually offer EDO w/parity. And while on the parity issue, make sure you buy "real parity" and not "logic parity" or "virtual parity." Some "genius" designed an asic to guess the 4 parity bits, and some vendors actually sell that junk. -- David Kelly N4HHE, dkelly@hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system.