Okay I just built my first custom PC and went out to buy the $30 Hyper 212 Plus from Amazon.com
When reading the reviews from there and Newegg, everyone with an overclocked i7 920/930 says they don't run any hotter than 70C.
I'm using Everest Ultimate and Real Temp version 3.4 to measure my temps but Real Temp doesn't show the CPU temp, only core temps. Which temp is the one that matters? Which one is the one everyone is talking about?
I would trust RealTemp more, CPU temp refers to the CPU case which is normally 5°C lower than the core. Those temperatures are a bit too high, you should keep your core temps below 75°C ideally at full load.
If you want it a bit cooler make sure that you did not overuse thermal paste and it spread evenly.