Date: Tue, 22 Sep 1998 08:04:20 -0400 From: Greg Pavelcak <gpavelcak@philos.umass.edu> To: freebsd-questions@FreeBSD.ORG Subject: Re: mixing RAM for FreeBSD ? Message-ID: <19980922080420.B7025@oit.umass.edu> In-Reply-To: <Pine.BSF.3.96.980921045358.4079E-100000@abc.xyz.net>; from groggy@iname.com on Mon, Sep 21, 1998 at 04:56:48AM -0800 References: <199809211439.IAA10132@argotsoft.com> <Pine.BSF.3.96.980921045358.4079E-100000@abc.xyz.net>
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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
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