if you want it easy just get single more powerful card. multi gpu configuration is not for someone that expect everything will work fine on day one(for newly released game). things like driver updates breaking SLI/CF support for games that already work for CF/SLI is not uncommon either. when i got my second 660 i fully understand what kind of problem i might run into when using such setup. but when it's really working the performance is amazing. and sometimes it is a cheaper way to get more performance. in synthetic benchmark (3D Mark11 to be exact) GTX660 SLI only a bit slower than a single 780 but in my country you can get 3 660 for a price of 780 alone.