I am going with a Sandy Bridge-E CPU (most likely the 3930k) and I was looking at the Hyper 212 Evo. A lot of people say that it can get to around 4.4ghz, and then gets hot. What if I were to use a push/pull configuration, along with a different thermal compound, like the Arctic MX2? Would I be able to reach 5ghz, or would I need to go with water cooling?