well thats why i and many others recommend 4x1gb

you can pick the best 2 sticks and run them in the best 2 slots to bench, and for 24/7 you load a BIOS profile for lower mem clock and more relaxed timings and throw in the other 2 sticks if you are on windows xp most likely you wont even need more than 2gb anyways

if you can hit 1800 cas7 with 4 sticks... on the premium im not so sure... on 790 ive already seen 2 people with cellshock do it.