From owner-freebsd-hardware Thu Jan 11 08:43:32 1996 Return-Path: owner-hardware Received: (from root@localhost) by freefall.freebsd.org (8.7.3/8.7.3) id IAA03016 for hardware-outgoing; Thu, 11 Jan 1996 08:43:32 -0800 (PST) Received: from pancake.remcomp.fr (root@pancake.remcomp.fr [194.51.30.1]) by freefall.freebsd.org (8.7.3/8.7.3) with SMTP id IAA03007 for ; Thu, 11 Jan 1996 08:43:18 -0800 (PST) Received: (from didier@localhost) by zapata.omnix.fr.org (8.6.12/8.6.9) id TAA17954; Thu, 11 Jan 1996 19:40:46 +0100 Date: Thu, 11 Jan 1996 19:40:46 +0100 (MET) From: didier@omnix.fr.org To: Stefan Esser cc: iain@nwpeople.demon.co.uk, freebsd-hardware@FreeBSD.org Subject: Re: anyone there using AMD's 133MHz chips? In-Reply-To: <199601111239.AA27510@Sysiphos> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-hardware@FreeBSD.org Precedence: bulk On Thu, 11 Jan 1996, Stefan Esser wrote: > On Jan 11, 11:32, Iain Baird wrote: > } Subject: Re: anyone there using AMD's 133MHz chips? > } Stefan Esser writes: > } > On Jan 10, 18:31, Dmitry Kohmanyuk wrote: > } > } Subject: anyone there using AMD's 133MHz chips? > } > } are there any problems/opinions on them? It is worth to choose them > } > } over 120MHz ones? (i.e., time make world on both) > } > > } > According to some reports I read, the 5x86 is not > } > significantly faster than the 486DX4/120, but it > } > has the advantage to work well on PCI only mother > } > boards, which prefer a 33MHz bus clock (and don't > } > like a 40MHz clock at all :-) > } > } I'm running a DX4-120 on a GA-486AMS PCI-only motherboard. > } This can clock PCI at CPU/2. By default, with CPU at 40MHz, > } PCI runs at 20MHz. > } > } However: I have tried setting CPU:PCI to 1:1, so PCI is clocked > } at 40MHz, and everything seems to work fine. So far at least. > } I have an AHA-2940 and a Diamond Stealth 64 (S3 968). I haven't > } done any benchmarking to compare the performance. > } > } Any comments on the wisdom of this? > > Well, this has got nothing at all to do with wisdom. > But a lot with luck ;-) > > PCI chip sets are designed for a 33MHz upper limit, > and I'd be afraid of overheating the expensive S3 > or AIC chips, and the mainboard PCI chip set as well > (eek, all soldered in :) > > I'd rather spend a few $ on the 133MHz variant, even > if it is no faster than the DX4/120. > > But that is a matter of personal taste ... > > Regards, STefan > > -- > Stefan Esser, Zentrum fuer Paralleles Rechnen Tel: +49 221 4706021 > Universitaet zu Koeln, Weyertal 80, 50931 Koeln FAX: +49 221 4705160 > ============================================================================== > http://www.zpr.uni-koeln.de/~se > I have been using a 486DX4-120 on my AL3 mother board (chipset acer labs) without any problems for nearly 3 months. When I replaced the 486DX4-100 by a 486DX4-120 the speed was dramaticly improved (37%) . I've never had any problems with the PCI boards. (AHA2940 and Miro Crystal 20SV) -- Didier Derny | My computer is Microsoft Free... didier@aida.org | Private FreeBSD 2.1-STABLE site