Mod your Arctic Cooling NV Silencer 5 to a 7900GT
 

The NVidia 7900GT cards are actually more compact than its 7800 predecessors, which means the entire NV Silencer 5 assembly is shifted towards the back of the computer by about half an inch. So I went psycho and hacked it to bits, and of course it works perfectly after its mutilation.

this might be very intresting considering the crappyness of the stock GT cooler