From owner-freebsd-questions Tue Sep 22 05:03:47 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id FAA20011 for freebsd-questions-outgoing; Tue, 22 Sep 1998 05:03:47 -0700 (PDT) (envelope-from owner-freebsd-questions@FreeBSD.ORG) Received: from oitunix.oit.umass.edu (nscs24p12.remote.umass.edu [128.119.179.76]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id FAA19985 for ; Tue, 22 Sep 1998 05:03:33 -0700 (PDT) (envelope-from gp@oitunix.oit.umass.edu) Received: (from gp@localhost) by oitunix.oit.umass.edu (8.9.1/8.9.1) id IAA09172 for freebsd-questions@FreeBSD.ORG; Tue, 22 Sep 1998 08:04:21 -0400 (EDT) (envelope-from gp) Message-ID: <19980922080420.B7025@oit.umass.edu> Date: Tue, 22 Sep 1998 08:04:20 -0400 From: Greg Pavelcak To: freebsd-questions@FreeBSD.ORG Subject: Re: mixing RAM for FreeBSD ? References: <199809211439.IAA10132@argotsoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.93.2i In-Reply-To: ; from groggy@iname.com on Mon, Sep 21, 1998 at 04:56:48AM -0800 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Mon, Sep 21, 1998 at 04:56:48AM -0800, groggy@iname.com wrote: > > > Another thing to keep in mind is that if you can mix, you'll probably slow > > your system down. Most motherboards that allow mixing will run at the slower > > SIMM speeds. I.e. SDRAM typically less than or equal to 12ns, SIMMs typically > > less than or equal to 60ns, the result is the overall machine will run its > > memory bus at the 60ns mark. > > i wonder is 12ns is overkill. i haven't done any calculations, > but i wonder if the RAM could be accessed fast enough to take > advantage of that speed. > > ? Seems to me I read somewhere that the 10/12ns numbers associated with SDRAM was a marketing ploy. Not that the numbers are inaccurate, just that the thing being measured at 12ns is *not* the same thing that is measured at 60ns in the SIMMS. When you start comparing apples/apples, the numbers are more like 55ns vs. 60ns. Or maybe this is a false memory. Greg To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message