Date: Sun, 23 Jun 1996 13:20:22 -0700 (PDT) From: "Jonathan M. Bresler" <jmb> To: nash@mcs.com Cc: freebsd-hardware@freebsd.org Subject: Re: Mixing SIMMs of different speeds Message-ID: <199606232020.NAA19050@freefall.freebsd.org> In-Reply-To: <199606222041.PAA13207@zen.nash.org> from "Alex Nash" at Jun 22, 96 03:41:26 pm
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Alex Nash wrote: > > I'm wondering if I can mix 60 and 70ns SIMMs. Everyone says don't, > but they don't say why. I can understand not mixing SIMMs that will > be accessed simultaneously (like banks 1 and 2), but why shouldn't it > work when they are separated? My motherboard's manual indicates 70ns > or faster will work, so why wouldn't a mixture? > > So I add 2 70ns SIMMs to the motherboard that had 60s in banks 1 and > 2, and (not too surprisingly) strange things happened. > > I removed the 60s and ran with just the 70s, it seems to be working > great. > > Now I'm starting to think, what if I ran with 70s in banks 1 & 2 and > 60s in banks 3 & 4? Since the motherboard runs with 70s ok, but the > 60/70 mixture didn't work the first time, it must be able to determine > the access speed. Is the motherboard using bank 1 to determine what > speed it should access memory with? (This is a Tyan S1462 MB.) i have 2x4MB-70ns simms in bank0 and 2x4MB-60ns simms in bank1 on an ASUS SP3G motherboard. no problems at all. systems was initially set up for 70ns simms. jmb -- Jonathan M. Bresler FreeBSD Postmaster jmb@FreeBSD.ORG FreeBSD--4.4BSD Unix for PC clones, source included. http://www.freebsd.org/ PGP 2.6.2 Fingerprint: 31 57 41 56 06 C1 40 13 C5 1C E3 E5 DC 62 0E FB
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