That's really hard to say because there are other factors involved - Ambient room temps, CPU Cooler, CPU Clock speed, Voltage settings, etc...
Anyway with my ambient room temps averaging 77F (25c) and my CPU overclocked from 2.80 to 3.52 gigs I'm averaging 71c load, 40c idle. See my system specs.
You can see my thoughts on the HAF X here -
Cooler Master’s HAF X