I have a Phenom II x4 965 Black edition and a Rosewill Challenger (if I could go back in time and get a Phantom, I definitely would). The stock heatsink fan that is included is louder than every other fan in my case combined when under full load and I want to upgrade to something quieter. (I personally don't care but I feel bad for my dad who sits 5 feet away from it when he works all day long) I was thinking of getting the Hyper 212 Evo but then I was talking to my friend and he recommended a closed loop system. I looked around NewEgg and I saw that the Hyper 212 Evo is quieter than most of the coolers in the same price range ($30-$50) but I don't know what the performance difference is. If you could help me out that'd be greatly appreciated!