I currently have 768MB of pc3200 ram on my DFI motherboard. The motherboard has three ram slots in which i have a 512 and a 256 ram module. I'm planning to upgrade becuase I run a lot of programs and sometimes my systems slows down becuase of lack of memory. I was thinking of buying a stick of 1gb of ram to make 1.75gb total. Is that over kill or should I buy a 512 stick instead? I'm also thinking about bf2 and other future games that might benefit from the extra ram. Thanks for the reply!