From owner-freebsd-hardware Sat Jun 22 14:55:09 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id OAA12215 for hardware-outgoing; Sat, 22 Jun 1996 14:55:09 -0700 (PDT) Received: from terra.Sarnoff.COM (terra.sarnoff.com [130.33.11.203]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id OAA12210 for ; Sat, 22 Jun 1996 14:55:08 -0700 (PDT) Received: (from rminnich@localhost) by terra.Sarnoff.COM (8.6.12/8.6.12) id RAA08475; Sat, 22 Jun 1996 17:54:16 -0400 Date: Sat, 22 Jun 1996 17:54:15 -0400 (EDT) From: "Ron G. Minnich" X-Sender: rminnich@terra To: Bradley Dunn cc: nash@mcs.com, freebsd-hardware@freebsd.org Subject: Re: Mixing SIMMs of different speeds In-Reply-To: <199606222118.RAA17013@ns2.harborcom.net> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hardware@freebsd.org X-Loop: FreeBSD.org Precedence: bulk simm speeds are determined by the speed grade jumpers soldered onto the simm module. RAM controllers use these jumpers to drive timing. If the hardware only uses one simm slot to determine timing for the system, AND you mix simm speeds, then obviously strange things are going to happen if the system drives 70 ns simms with 60 ns timing. ron Ron Minnich |"Inferno runs on MIPS ..., Intel ..., and AMD's rminnich@sarnoff.com |29-kilobit-per-second chip-based architectures ..." (609)-734-3120 | Comm. week, may 13, pg. 4. ftp://ftp.sarnoff.com/pub/mnfs/www/docs/cluster.html