I need some DDR2 RAM to go with my new intel motherboard and I'm on a limited budget. I can get a stick of 512mb Corsair value RAM for like $80 now, and eventually get more once I can afford to do so. So I want to know if 512 would be enough with my setup and a pci-e 6600GT. I may overclock slightly, but let me know if that's bad idea.