I'm using two sticks of Geil ram (2x512mb) in my system at 2.5-4-4-6 and stock voltage for my mobo (asus p4s800). http://www.newegg.com/Product/Product.asp?Item=N82E16820144310 i'm very satisfied! its running at 215 mhz and ive never had any stability problems. couldnt get it down to cas 2 though......