I was thinking 200/266 fsb for some reason ddr 200 x 2 = 400 , hm i donno . lol , but anywho ya it says on my main board that i can run upto 2 gigs of ddr 400 ram butr i have 3 slots for ram wich means by all means i can run 3 gigs , so i dont what they are saying either.