04-11-2005, 09:24 AM
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Confirmed User
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Join Date: Mar 2002
Location: Norway
Posts: 272
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Quote:
Generally, you can mix speeds, but you must operate the system at the speed of the slower of the two modules. The problem can arise because most modern memory modules have an "SPD" chip (serial presence detect), a ROM that lets the computer "READ" the specs of that memory module. If two such modules conflict, the computer might not configure the system in a useable manner (this would be a function of the BIOS code). You can try a manual over-ride in the BIOS and see if that helps.
There are other incompatabilities that can arise, the general rule that you can mix speeds isn't hard and fast, it's just a guideline.
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http://www.dslreports.com/forum/remark,13086488
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