From owner-freebsd-stable@FreeBSD.ORG Thu Mar 31 18:59:02 2005 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id DF16B16A4CE; Thu, 31 Mar 2005 18:59:02 +0000 (GMT) Received: from dragon.NUXI.org (trang.nuxi.com [66.93.134.19]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6AE7743D58; Thu, 31 Mar 2005 18:59:02 +0000 (GMT) (envelope-from obrien@NUXI.com) Received: from dragon.NUXI.org (obrien@localhost [127.0.0.1]) by dragon.NUXI.org (8.13.3/8.13.3) with ESMTP id j2VIx2xl002075; Thu, 31 Mar 2005 10:59:02 -0800 (PST) (envelope-from obrien@dragon.NUXI.org) Received: (from obrien@localhost) by dragon.NUXI.org (8.13.3/8.13.1/Submit) id j2VIx28q002074; Thu, 31 Mar 2005 10:59:02 -0800 (PST) (envelope-from obrien) Date: Thu, 31 Mar 2005 10:59:02 -0800 From: "David O'Brien" To: "Greg 'groggy' Lehey" Message-ID: <20050331185902.GF1687@dragon.NUXI.org> References: <20050330222439.GU84137@wantadilla.lemis.com> <20050330223546.GA4705@troutmask.apl.washington.edu> <20050330224445.GW84137@wantadilla.lemis.com> <200503311032.33718.doconnor@gsoft.com.au> <20050331015429.GH6252@wantadilla.lemis.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050331015429.GH6252@wantadilla.lemis.com> 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/1.5.9i cc: freebsd-stable@FreeBSD.org cc: FreeBSD-amd64@FreeBSD.org Subject: Re: Problems with AMD64 and 8 GB RAM? X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list Reply-To: freebsd-stable@FreeBSD.org, FreeBSD-amd64@FreeBSD.org List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 31 Mar 2005 18:59:03 -0000 On Thu, Mar 31, 2005 at 11:24:29AM +0930, Greg 'groggy' Lehey wrote: > On Thursday, 31 March 2005 at 10:32:33 +0930, Daniel O'Connor wrote: > > On Thu, 31 Mar 2005 08:14, Greg 'groggy' Lehey wrote: > >>> Have you run sysutils/memtest86 with the 8 GB? > >> > >> Heh. Difficult when the system doesn't run. > > > > You could try http://www.memtest86.com although that doesn't do >4Gb > :( > > I'm pretty sure it's not the memory. I've tried each pair > individually, and it's only when they're both in there together that > it's a problem. And yes, I've tried them in each pair of slots. You have a dual-channel memory controller. If you insert one DIMM you perform 64-bit data accesses. If you install DIMM's in pairs (making sure you're using the right "paired" sockets), you perform 128-bit data accesses. Thus your access pattern is different between these two situations. I'm highly suspious that you can us 4x2GB DIMM's with out knowing the exact part number. Don't forget 2GB DIMM's are double-stacked and thus look like double the electrical bus loads. The same is true for older 1GB DIMM's. Install all the memory you would like to use into your motherboard, download memtest86+ version 1.40 from http://www.memtest.org, dd to floppy or burn the ISO, and report back your findings from running it. Also what version of the BIOS are you using? -- -- David (obrien@FreeBSD.org)