Quote Originally Posted by Plywood99
Sounds like the water block is hitting the cam box on cpu socket, preventing proper contact. Try slipping a piece of paper between water block and cam box. If it does not slide between the two then they are probably in contact and preventing a proper mount. Take some sand paper and lightly sand the top of cam box.

I had this happen on my an8sli board. A little sanding fixed the problem...
but the wied thing is that my sd 3700+ works perfekt naked aswell