I have a CUSL2 which is virtually the same board concerning fan mounting, and I have a GORB on it. It has been reported that this fan is difficult to mount, and it was a very delicate operation, however I really didn't have much of a problem. I took the motherboard with the 700E already installed and the anti-static bag it came in and set it on the glass kitchen table and patiently mounted the fan. The key is taking your time.
The GORB is a good HSF and the 4500rpm fan is super quiet.
Hope this helps,
Mike