With a Cooler Master Hyper 212 EVO, you should be seeing load temperatures of around 50-55C on Prime95. (I get those temperatures on my i7 2700k without Hyperthreading). With a mild overclock of around 4.6Ghz (with 1.3v give or take), I can expect temperatures of around 65-70C.
Of course, every CPU is different, so you may see temperatures a little higher, or a little lower than what I'm mentioning.