Then your OS will only be able to use just over 3gb of ram so, you are better off just getting one more stick of 1gb than 2gb. Why would you need 4gb of ram anyways? Do you ever hit max ram usage of your current 2gb? If not, then buying more ram is NOT going to increase the performance of your pc at all.
well the thing is one of my sticks are dead and i already turned in the rebate so i can't get another so im running at 1 gig so im going to be running at 3 gigs when i buy the patriots