Date: Sat, 22 Jun 1996 15:41:26 -0500 (CDT) From: Alex Nash <alex@zen.nash.org> To: freebsd-hardware@freebsd.org Subject: Mixing SIMMs of different speeds Message-ID: <199606222041.PAA13207@zen.nash.org>
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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.) Alex
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