I have tried to upgrade the computers memory, without any success. purchuased 2x1GB pc2 6400 OCZ memory, but it just wouldn't work. The motherboard is Asus M2N-SLI Deluxe, and has 2x512 MB pc2 7200 memory installed. I know that the memory can't be mixed(different clock speed), but it would not work with only the two 1GB pc 6400 memory. Although as far as I could see the motherboard should take only pc2 6400 memory, but the manufacturer (MESH) installed pc2 7200 meory modules. All this on Windows XP Home SP2.
There have been a number of reported issues with OCZ memory and Asus motherboards hence I steer clear, but a lot of what I read suggested checking the voltage requirements of the RAM (older Asus boards couldnt provide high enough voltage) and also a number of people managed to get it working by installing one strip at a time and rechecking bios settings after each installation - the OCZ forum above covers it..
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