Hi, a friend of mine is upgrading his rig, and he was able to sell his previous card for a cheap price to me. Now I've got 2 GTX960s laying around, and I'd like to put them both into my system. The issue is that my motherboard only has one 16x slot, one 4x slot, and a few 1x slots. I heard that SLI needs 8x at least. The question is, wil my system perform better with those 2 cards, without SLI, or doesn't it make any difference?