if your getting your 900 from here you might want to make sure you get the version 2, version 1 (the one i got a week ago) apparently doesn't have enough room for the dvi output on the 8800.
see here for more details
http://forums.overclockers.co.uk/showthread.php?t=17676304
see here for more details
http://forums.overclockers.co.uk/showthread.php?t=17676304