Gigabyte x58a ud3r with palit gtx 560ti 2gb in sli

you would have to run the cards in pci-e slot 1 and 3, 1 and 4, and 2 and 4, your motherboard manual will tell you which to use. some of the slots will probably be x16 x8 or x4. try and get both video cards into x16 slots, but x8 is just as good.