i just paid 100 pound, if your in the states that will be about 145 dollars, the SD, is the type of ram i have,,,, it all depends on what type of ram your motherboard supports,,, ask sumone who knows what they are on about to take a look,,, you could have SDram, PCIram or the best of the best DDRram which stands for Double Data Rate. (very cool) with my setup (1.3mhz processor) which is really very basic., i can run call of duty on full very smoothly....