Date: Sun, 15 Sep 1996 03:53:14 -0700 (PDT) From: "Rodney W. Grimes" <rgrimes@GndRsh.aac.dev.com> To: achou@best.com (Amanda Chou) Cc: michaelv@MindBender.serv.net, questions@freebsd.org, hackers@freebsd.org, hardware@freebsd.org Subject: Re: Q: Tyan Tomcat I with > 64MB RAM Message-ID: <199609151053.DAA00240@GndRsh.aac.dev.com> In-Reply-To: <Pine.SGI.3.93.960915010309.26333B-100000@shellx.best.com> from Amanda Chou at "Sep 15, 96 01:21:45 am"
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... > > Actually we solved the problem already, and the solution is fairly simple > (but not terribly obvious). I got those 8 16MB EDO RAMs from two different > places: Fry's and Chip Merchant. Fry's get their chips from different > suppliers, while Chip Merchant get theirs only from one place. As soon as > we put Fry's RAM in lower banks and Chip Merchant's in the higher banks, > bingo, it started working! Someone at Chip Merchant is not telling you the whole truth. They may be _buying_ all thier memory from the same memory broker, but it comes from all over the place. Just taking a sample of my last 5 orders of 32MB, 8MBx36-60nS FPM 24 chip modules I show these manufactures: LGS on 3rd party LGS with MT parity on Liteon OKI on 3rd party OKI on 3rd party SEC on 3rd party You have a very slim chance of getting the same memory 2 orders in a row from the Chip Merchant, and realize I am a manufacturer who is order in volume once or twice a week. (Okay, so now all your folks know where AAC gets good memory from :-)). > > The lesson we learned is: try to get all your memory made from the same > factory if you try to build a system with more than 64MB RAM. Let me guess that some of this EDO memory is made by someone other than Micron, yea, let me see if I can put my finger on it... could it possibly be Siemens? If so be wary, there is a huge batch of these chips floating around that appear to be marginal. -- Rod Grimes rgrimes@gndrsh.aac.dev.com Accurate Automation Company Reliable computers for FreeBSD
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