get whatever ram u want, pc6400 or 800mhz ram (same thing) is the standard. dont get 1066mhz ram, causes problems in some mobos. either way, asus is dumb, get a Gigabyte. GA-P35-DS3L is the way to go. search for it on newegg.com, over 1300 reviews, with a customer award. it rocks!!!!! get it. dont worry about memory, they'll run at their clock u buy them, unless its like 1066mhz ddr2 ram which is basicly overclocked 800mhz ram.