Re: "Dual 2GB GDDR5 NVIDIA GeForce GTX 580M – SLI" vs "Dual 2GB GDDR5 AMD Radeon HD 6970M CrossfireX"
Thats not entirely true.
Gpu's and games are an odd thing. Some games excel on amd, others nvidia.
But yes, the nvidia top cards do beat the top amd, but not by a huge margine and the cost doesnt always justify that gain.
Plus SLI/xfire doesnt always scale well, so you might get 8 or 12 fps more by dual cards, yet it could be alot pricier.
The next thing you need to think is deual cards really gonna be worth the price? is 50 fps worth the cost for 65 or 70 fps when gaming.
But anyway, you should check reviews orf the cards anbd get the one that excells at the games you play.
Foldie = i7 950@ 4.0Ghz Gigabyte x58a-ud3r EVGA 970 SC Corsair H100 Corsair hx520 3x2gb OCZ Gold Corsair 650D
Woohoo = L5639 @3.1Ghz EVGA SR-2 gtx 260-216 Hyper 212+ Corsair 1050hx 6x2gb Corsair XMS3 Blackhawk Ulra
Alienware 18 - SLI 770M 4700mq 16Gig