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Newsgroups: comp.os.386bsd.questions Path: sserve!newshost.anu.edu.au!munnari.oz.au!bruce.cs.monash.edu.au!harbinger.cc.monash.edu.au!msunews!agate!howland.reston.ans.net!Germany.EU.net!news.dfn.de!news.belwue.de!delos.stgt.sub.org!nadia.s.bawue.de!luva!migieger From: migieger@luva.lb.bawue.de (Michael Giegerich) Subject: Re: AMD DX2/80 w/ NetBSD? Keywords: PCI Organization: private FreeBSD site Message-ID: <D1Iv0G.2Cp@luva.lb.bawue.de> References: <3d71n3$2hp@solaris.cc.vt.edu> <MICHAELV.94Dec21161813@MindBender.HeadCandy.com> <3dpefhINN3u8a@rs1.rrz.uni-koeln.de> Date: Wed, 28 Dec 1994 13:05:03 GMT Lines: 30 >|> If you find a 486 PCI motherboard that can clock the CPU at 40MHz, >|> let me know. >|> >|> One problem is that the PCI spec specifically states that the >|> supported speeds for the PCI bus are 25MHz to 33MHz. The PCI bus will >|> not run at 40MHz. So, you would have to uncouple the CPU clock from >|> the PCI bus clock. I don't see any real problem with doing this >|> (after all, the PCI bus was designed to be uncoupled from the CPU), >|> but in the interest of cost, it appears that nobody had designed a >|> motherboard this way. As long as the motherboard designer keeps the >|> bus and CPU clocks coupled, you won't be able to go over 33MHz with >|> PCI. > >There was a review of PCI + VLB motherboards >in c't magazine, issue 8'94, if I remember right. There's a test of Pentium/PCI motherboards in c't 12.94. The ASUS 60/66 and 90/100 boards support both 40 MHz too. Both ratet among the best motherboards available (speed and compatibility). Perhaps ASUS is offering something alike for 486 mother- boards too? -Michael -- ------------------------------+------------------------------ Michael Giegerich | migieger@luva.lb.bawue.de ------------------------------+------------------------------