Memtest is kind of a waste of time. If the machine boots to bios and shows the correct amount of RAM, 99.99% of the time they are good. The problem you can run into with older machines is that they can only recognize 3GB(or sometimes 3.5GB). If the 4th stick is bad, you may not notice. On DDR machines I usually just do two at a time to make sure. I have tested hundreds of sticks on the same machines and they have not worn out yet.
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