I have just installed a gigabyte GA-890GPA-UD3H Mobo with 2 x gts 450 graphics, everything works, the cards are seen, I have win7-64 but SLI doesn'r, I believe it may be because i need a bridge. I contacted the Mobo prov who sent me a bridge (made by ASUS) which still doesn't give me SLI, anyone have any idea??