From owner-freebsd-amd64@FreeBSD.ORG Sat Nov 13 18:40:27 2004 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 E993216A4D0; Sat, 13 Nov 2004 18:40:27 +0000 (GMT) Received: from canning.wemm.org (canning.wemm.org [192.203.228.65]) by mx1.FreeBSD.org (Postfix) with ESMTP id C7D6B43D45; Sat, 13 Nov 2004 18:40:27 +0000 (GMT) (envelope-from peter@wemm.org) Received: from fw.wemm.org (canning.wemm.org [192.203.228.65]) by canning.wemm.org (Postfix) with ESMTP id 7EEE52A8DD; Sat, 13 Nov 2004 10:40:21 -0800 (PST) (envelope-from peter@wemm.org) Received: from overcee.wemm.org (overcee.wemm.org [10.0.0.3]) by fw.wemm.org (Postfix) with ESMTP id A787BE2B5; Sat, 13 Nov 2004 10:40:20 -0800 (PST) (envelope-from peter@wemm.org) Received: from overcee.wemm.org (localhost [127.0.0.1]) by overcee.wemm.org (8.13.1/8.13.1) with ESMTP id iADIeJgk070839; Sat, 13 Nov 2004 10:40:19 -0800 (PST) (envelope-from peter@wemm.org) Received: from localhost (localhost [[UNIX: localhost]]) by overcee.wemm.org (8.13.1/8.13.1/Submit) id iADIeJiA070838; Sat, 13 Nov 2004 10:40:19 -0800 (PST) (envelope-from peter@wemm.org) X-Authentication-Warning: overcee.wemm.org: peter set sender to peter@wemm.org using -f From: Peter Wemm To: freebsd-amd64@freebsd.org Date: Sat, 13 Nov 2004 10:40:19 -0800 User-Agent: KMail/1.7 References: <20041112232414.GA97523@ip.net.ua> <20041113075801.GA3411@ncore.dglawrence.com> <20041113082133.GG30146@ip.net.ua> In-Reply-To: <20041113082133.GG30146@ip.net.ua> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200411131040.19492.peter@wemm.org> cc: amd64@freebsd.org Subject: Re: SK8N woes X-BeenThere: freebsd-amd64@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Porting FreeBSD to the AMD64 platform List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Nov 2004 18:40:28 -0000 On Saturday 13 November 2004 12:21 am, Ruslan Ermilov wrote: > On Fri, Nov 12, 2004 at 11:58:01PM -0800, David G. Lawrence wrote: > > > On Sat, Nov 13, 2004 at 12:25:48AM +0100, Gert Cuykens wrote: > > > > no registered memory works ONLY yes ONLY with registered memory > > > > > > What do you mean? This memory type (please read below) is > > > explicitly listed in section 2.4.3 (Qualified Vendor List) > > > of the SK8N manual as "memory modules that have been tested > > > and qualified for use with this motherboard". > > > > > > > > - Memory: Kingston KVR333X72C25/512 (this is in the list > > > > ^R > > > > Are you sure that it doesn't have an "R" before the "C" in the > > above part number? > > I have modules without the "R" letter, and the manual lists them > with "R". I assume "R" means "registered", so that must explain > it. THANKS A LOT!!! Yes, the R is registered. For the opteron and socket 940 athlon64's, you need registered dimms. For socket 754 and 939 athlon64's, you need unregistered dimms. Registered dimms are slightly slower overall because they add an extra half clock latency for the buffers to sample and latch the data. But it allows much longer trace lengths between the cpu and dimms and allows more dimm sockets. FWIW ECC is just extra bits on the dimms (72 bit vs 64 bit), it is unrelated to whether it is registered or not. I use *un*registered ECC dimms on my socket 754 motherboards. -- Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com "All of this is for nothing if we don't go to the stars" - JMS/B5