Old but cripes this is a solid review... http://www.rage3d.com/reviews/video/.../index.php?p=1

Watch out for the odd puck word, but there's the 7950 GX2, 7900 GTX and the X1950XTX benched in there too.

One focus being, there isn't much on the systems at all and the peak load wattage drained, whilst running a SINGLE BFG 8800 GTX, is 354Watts

So bear it in mind, that the GPU CAN drain quite a bit of power. Here is what I am referring to witnessed on one of the pages: