From owner-freebsd-stable Fri Aug 13 16:48:36 1999 Delivered-To: freebsd-stable@freebsd.org Received: from dingo.cdrom.com (dingo.cdrom.com [204.216.28.145]) by hub.freebsd.org (Postfix) with ESMTP id 434B21504A for ; Fri, 13 Aug 1999 16:48:34 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Received: from dingo.cdrom.com (localhost.cdrom.com [127.0.0.1]) by dingo.cdrom.com (8.9.3/8.8.8) with ESMTP id QAA01905; Fri, 13 Aug 1999 16:42:04 -0700 (PDT) (envelope-from mike@dingo.cdrom.com) Message-Id: <199908132342.QAA01905@dingo.cdrom.com> X-Mailer: exmh version 2.0.2 2/24/98 To: "Rodney W. Grimes" Cc: freebsd-stable@FreeBSD.ORG Subject: Re: On freezes in 3.2-Stable (fwd) In-reply-to: Your message of "Thu, 12 Aug 1999 03:59:08 PDT." <199908121059.DAA10520@gndrsh.aac.dev.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Fri, 13 Aug 1999 16:42:04 -0700 From: Mike Smith Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > I didn't realize this person asked this off list, so I am forwarding > my reply onto the list, it has information in it that someone should > use to write a FAQ/FSA, this issue has come up some many times over > the years that I am getting sick of reading it every time memory > generations change. > > Basic rule, Don't ever expect to be able to drive more than 72 DRAM > chips with anything in the PC world, period. You have to do bus > buffering using balanced drivers and real clean layout work on the PC Board, > and there ain't a PC maker out there who is going to bother with > this unless they are supporting 8 sockets or more in high dollar > server machines. Er. The Intel AD450NX has 32 DIMM sockets. Unless someone starts making 2-chip DIMMs, I don't see how you would run 8GB in this box (and I have seen it being done under other operating systems). You might want to qualify the issue a little further; specifically with regard to "typical memory controllers", logic families and fanout. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message