Date: Wed, 3 Apr 2002 01:22:45 +0200 From: Bernd Walter <ticso@cicely8.cicely.de> To: Wilko Bulte <wkb@freebie.xs4all.nl> Cc: Christian Weisgerber <naddy@mips.inka.de>, freebsd-alpha@FreeBSD.ORG Subject: Re: Source of "processor correctable error"? Message-ID: <20020402232244.GP41357@cicely8.cicely.de> In-Reply-To: <20020402192425.B43540@freebie.xs4all.nl> References: <a89rrl$2vek$1@kemoauc.mips.inka.de> <20020401152244.GE41357@cicely8.cicely.de> <a8chg1$11e$1@kemoauc.mips.inka.de> <20020402163220.GO41357@cicely8.cicely.de> <20020402192425.B43540@freebie.xs4all.nl>
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On Tue, Apr 02, 2002 at 07:24:25PM +0200, Wilko Bulte wrote: > On Tue, Apr 02, 2002 at 06:32:20PM +0200, Bernd Walter wrote: > > Generaly speaking they have to be the same because the are all > > addressed in a single bank and so claims the documentation. > > But practical speaking you could try a random vendor 24 chip simm > > with a very good success chance. > > I wouldn't try to mix with a 18 chip simm. > > Theoreticaly even edo should work, but you don't get a speed gain > > and they are rare. > > Are you absolutely sure? I don't think we ever used EDO *SIMMs* > on Alpha machines. EDO and fastpage are nearly the same. EDO only has a longer data output phase while traditional fast page go into tri-state. The speed gain is that you can already take the steps for the next access, while still taking the current data. If you have a board not doing bank interleaving they are often interchangeable as the small difference doesn't matter. > There are some boxes using EDO *DIMMs* (like the AS500 > sitting next to me) Nice shoot - it's the same chipset (21172) as the PC164... But no sign of a possible speed gain in the chipset docs. They should work with identic speed as fastpage. -- B.Walter COSMO-Project http://www.cosmo-project.de ticso@cicely.de Usergroup info@cosmo-project.de To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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