I bought a SLI AM3 motherboard and knew it was x8/x8 when I bought it. My question is though is it worth it to return the board and get another that has SLI speeds at x16/x16? The price would be almost double what I payed for the x8/x8 board. I will be getting one GTX 260 for now, then getting another down the road once I can get the card and a new PSU. Do these cards even use all the bandwidth of PCIe 2.0? Would I really see any performance difference? How big of a performance difference is there between x8/x8 and x16/x16. I have read in the past its usually negligible.