I just wanted to check my temperature with you, I have two other fans in my case, one intake and the other is an exhaust fan. I get around 52C average after 1 hour of prime 95 and idle temperature are around 27-30C, but these are at stock clocks, do you think I could make it to 4.5Ghz/4.2Ghz?
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Sure you can, the Hyper 212 EVO is pretty much the best reviewed cooler ever ;D. Those temps are pretty normal. Also remember to OC slowly.
I have a similar setup but used the automated ASUS overclock with my 212 evo, it bumped my 2500k to 4.3 no problem and my temps with prime95 are like 62C tops.