Hi, I recently was given a new 512mb DDR400 RAM by a friend who stupidly didn't actually check whether it was compatible. I have added it to my own 512mb DDR400 in my Gigabyte motherboard. Individually, both work fine, however when they are both in, the computer still only acknowledges 512mb. I upgraded my BIOS, but that hasn't fixed the problem. Can anyone offer any suggestions for stupid things I have done wrong? Should I have any options involving RAM in the BIOS, because I can't find any. Thanks in advance. Edit: I should add that I tried the various different positions and orders of inserting the RAM, which did not make a difference.