From owner-freebsd-amd64@FreeBSD.ORG Mon Feb 28 19:49:04 2005 Return-Path: Delivered-To: freebsd-amd64@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 0F06916A4CE for ; Mon, 28 Feb 2005 19:49:04 +0000 (GMT) Received: from dragon.nuxi.com (trang.nuxi.com [66.93.134.19]) by mx1.FreeBSD.org (Postfix) with ESMTP id 7B3BB43D69 for ; Mon, 28 Feb 2005 19:49:03 +0000 (GMT) (envelope-from obrien@NUXI.com) Received: from dragon.nuxi.com (obrien@localhost [127.0.0.1]) by dragon.nuxi.com (8.13.1/8.13.1) with ESMTP id j1SJmwfZ059366; Mon, 28 Feb 2005 11:48:58 -0800 (PST) (envelope-from obrien@dragon.nuxi.com) Received: (from obrien@localhost) by dragon.nuxi.com (8.13.1/8.13.1/Submit) id j1SJmvX9059365; Mon, 28 Feb 2005 11:48:57 -0800 (PST) (envelope-from obrien) Date: Mon, 28 Feb 2005 11:48:57 -0800 From: "David O'Brien" To: Roman Neuhauser Message-ID: <20050228194857.GA59327@dragon.nuxi.com> 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> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050228083319.GA379@isis.wad.cz> X-Operating-System: FreeBSD 6.0-CURRENT Organization: The NUXI BSD Group X-Pgp-Rsa-Fingerprint: B7 4D 3E E9 11 39 5F A3 90 76 5D 69 58 D9 98 7A X-Pgp-Rsa-Keyid: 1024/34F9F9D5 User-Agent: Mutt/1.5.8i cc: freebsd-amd64@freebsd.org Subject: Re: FreeBSD 5.3 installation on Asus K8V-D impossible? X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: freebsd-amd64@freebsd.org List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Feb 2005 19:49:04 -0000 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)