On Mon, 19 Nov 2001 15:44:15 -0600, Jon Elson wrote:
>Sure, the memory bus is pretty well characterized, but all
>memory chips
>come off a line where they are tested, and some percentage of
>them have
>bad rows and columns.  The memory testing is not really
>rigorous, although
>most makers retest the 'stick' after placing the cips on it.

Actually, the high speed digital testers employed by the memory 
manufacturers FULLY test memory modules over their rated speed 
and voltage ranges. Usually any problems that occur after the 
module leaves the factory are due to handling, installation or 
motherboard related issues (timing, voltage, noise, etc.) Memory 
chips themselves are 100% parametrically tested after they are 
packaged since the manufacturer is in the business of selling 
specified, functional chips. 

At any rate... if anyone is interested in FULLY testing your 
system memory, you can get a great FREE memory test program at:

http://www.teresaudio.com/memtest86/

It will exercise all your memory, CPU cache memory, etc. If 
there's a memory bug, it will almost certainly find it. An 
invaluable tool for evaluating your hardware setup.

Matt Pobursky
Maximum Performance Systems

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