Get (2) 512mb sticks of PC3200. Your mobo is dual channel which means you have to run 2 sticks of the same RAM. PC3200 is the highest speed of RAM your mobo will take. Also consider the speed of your RAM that is already in your comp. If you have PC2700 already in there, then if you put PC3200 in there it will only run at the same speed as the PC2700 that you alredy have.