Date: Wed, 11 Aug 1999 11:34:18 -0400 From: Daniel Tso <dan@tsolab.org> To: tcobb@staff.circle.net, freebsd-stable@FreeBSD.ORG Subject: Re: On freezes in 3.2-Stable Message-ID: <37B197FA.B0D98D65@tsolab.org> References: <307D63ED6749CF11AAE9005004461A5B405A@FREYA>
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> >We take out the added memory, and then everything is going well. > > I thought that might be the situation. So I removed the memory > and put it into another box which worked fine w/ just that one > DIMM. I'm guessing now that the memory was fine, but support > for 1GB was the problem. >> Supermicro can't handle a full 1GB, despite their specs Just in case this tidbit isn't completely obvious... There are situations with motherboards and particular memory SIMM/DIMMs in which, from a digital/logical/programming standpoint, you can fill up to the max amount of support memory -- no problem. However from an *electrical* standpoint, it becomes unreliable or simply not workable. These situations often have to do with the maximum amount of capacitance the memory driving circuits can handle. Modern dynamic RAM is nothing but a whole bunch of capacitors. Plus there is appreciable capacitance in any IC or circuit. This is why sometimes it matters whether a SIMM has 3 chips or 9 chips, or 12 chips or 36 chips, etc, even though the digital/logical circuit is the same and the amount of memory is the same, the *electrical* interface that that SIMM presents to the memory bus can be quite different. So you may, if you can, wish to play with different DIMM/chip configurations. Or pose this sort of question to Supermicro... To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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