The big advantage Crossfire has over SLi is that you can combine two of any ATI ready Crossfire models, and not just limited to the eact same type. It also doesn't split the PCI-Express into two 8x, and keeps them both at 16x which is much faster than SLi. But guess what?? nVidia heard this and thought, well we'll do the same Unfortunately, that technology allowing SLi to handle two 16x graphics cards is only available next year I think and you have to buy yet again, a new SLi capable motherboard that supports 2 16x slots in SLi mode