Oh crap !!! I almost choked. Install it backwards, gulp. Did you look to see how much of the core is covered by the base of the ORB. About half. Can't believe Jonny was so calm. NEVER install it backwards.
There are so many AMD approved HSF's (no ORB of any kind on AMD's list) that I don't see why people are so taken by ORBs, I think they are mostly show and not much go.