Date: Fri, 13 Aug 1999 16:42:04 -0700 From: Mike Smith <mike@smith.net.au> To: "Rodney W. Grimes" <rgrimes@gndrsh.aac.dev.com> Cc: freebsd-stable@FreeBSD.ORG Subject: Re: On freezes in 3.2-Stable (fwd) Message-ID: <199908132342.QAA01905@dingo.cdrom.com> In-Reply-To: Your message of "Thu, 12 Aug 1999 03:59:08 PDT." <199908121059.DAA10520@gndrsh.aac.dev.com>
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> 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
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