5960 = 170
980 = 200 watts OC'd = 600 watts
Pump = 20 watts
690 watts x 60% for delta T of 10C ~ 414 watts
Downloading the radiator Size Estimator for XSPC here:
http://www.overclock.net/t/1457426/radiator-size-estima...
We see that the EX (closest to AX) has the following capabilities.
The EX 360 can remove 169 watts with single fan set up and 205 in push / pull at 1250 rpm
So two of them should get you to 410 watts in push / pull which is close enough
Better yet, I'd use a 420 on top and a 360 / 480 on the bottom if ya haven't bought yet ... Thes efans will outperform the Noctuas, the GTs and anything else
140mm for 420 rads -
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
120mm for 360 rads -
http://www.newegg.com/Product/Product.aspx?Item=N82E168...