if you look it up on google, it will say that it doesnt make much difference at all. it might affect the frames per second by about 5. in crossfire it will be miles better than just having 1, think about it, 2 card put together better than 1? the bus lane speeds barely affects it. Sprento, i can safely say that by you suggesting to get another board is a very bad idea unless its alot cheaper than the one you have. obviously if you did have lots of money then you should get a board with 16x but if you dont, then dont bother.