Originally Posted by cikanovo
Your current platform will be bottleneck for two gtx 480's, even with 8xAA.
PCI-E slots at x8 should not be a concern, but the platform itself is the limiting factor for such a high end graphics cards.
When you're running gtx480 in SLI you need as much CPU power as you can get.
Also, Zotac AMP gtx480 cards are three slot cards, and you won't be able to fit 2 of those unless you buy EVGA Classified or ASUS Rampage III Extreme( if you want your cards to be in x16 slots) and computer case with 9 expansion slots such as Coolermaster HAF-X.
Case is no issue; I've got a HAF 932, and the EVGA nForce 750i FTW SLI has two PCI slots between the first and second PCI-E slot: enough for two Zotac AMPs