Right now I have a dell with 2x256mb PC3200 ram running in dual channel mode. I want to buy another 1gb because its so cheap ( 2x512mb Corsair XMS PC3200 is only ~$230 at NewEgg ) but I was just curious if I should take out the old ram thats in there and just run the Corsair? Or would it be better to mix the brands of ram and have a total of 1.5GB?