Date: Mon, 28 Feb 2005 11:48:57 -0800 From: "David O'Brien" <obrien@freebsd.org> To: Roman Neuhauser <neuhauser@chello.cz> Cc: freebsd-amd64@freebsd.org Subject: Re: FreeBSD 5.3 installation on Asus K8V-D impossible? Message-ID: <20050228194857.GA59327@dragon.nuxi.com> In-Reply-To: <20050228083319.GA379@isis.wad.cz> References: <25805.1109507962@www41.gmx.net> <20050228021220.GB13696@dragon.nuxi.com> <422289DB.5090408@sdodson.com> <4222A92E.6020500@gmx.net> <84dead72050227215243be0950@mail.gmail.com> <20050228073954.GA14037@isis.wad.cz> <20050228082523.GB38063@dragon.nuxi.com> <20050228083319.GA379@isis.wad.cz>
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On Mon, Feb 28, 2005 at 09:33:19AM +0100, Roman Neuhauser wrote: > # obrien@freebsd.org / 2005-02-28 00:25:23 -0800: > > On Mon, Feb 28, 2005 at 08:39:54AM +0100, Roman Neuhauser wrote: > > > What memory did you have in the box? I've had the same problem with > > > K8T Neo-FIS2R and 3x Corsair CMX512-3200C2. The board only works > > > with a narrow selection of 400MHz modules. :( > > > > Actually I would read the mobo *and* AMD docs very, very carefully. > > Using 3x DDR400 (PC3200) DIMM's is out of the JEDEC spec, IIRC. I stick > > to DDR333 (PC2700) memory as its easy to find CL2.5 DIMMs, but most > > DDR400 is CL3.0. So the end performance in the BW increase is mostly a > > wash; and I avoid the electrical loading issues of the faster memory bus. > > I'll admit I'm not an expert on hardware, can you point out what's > wrong with the configuration (3 double-sided 400MHz modules)? It is an electrical load issue. The non-buffered memory controller can only drive 2x DDR400 loads. A 939-pin dual-channel memory controller Athlon64 can drive 4x DDR400 loads. An Opteron can drive more due to being buffered/registered memory. -- -- David (obrien@FreeBSD.org)
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