I've just been looking at the QVL for this particular motherboard. I have been given part numbers, KHX6400D2LL/1G and XMS2-6400. The first is KIngston RAM and the other is Corsair. Ive found the Kingston RAM (only comes in 1gig sticks) but am confused to which the other is. Also, which should I choose? C4 or C5? Cheers.