i just built a new system my self dual 5870s i7 930 oc to 3.2GHZ and 12GB of ram one thing to point out buy a 12GB kit not 2 6GB kits.
i did this at first thinking i could save a few $$$ and ended up getting shipped 2 very diffrent kits same band/company but happen to be made at different dates and ended up with different versons and had all kind of problems BSOD mainly so make sure its a 12GB kit.