One dedicated Gpu. So in your example if you were spending 300 on the graphics card, instead of buying 2 660's, you'd buy one 300 dollar card. All 3 of those brands make good cards, what you'll be looking for is the cooling solution on them. eVga has their ACX cooler, Asus has directcu, and MSI has the twin frozr. Usually, the stock clock rates will be higher than normal when the better cooling solutions are used, so that will help tip you off.