I have the same motherboard, and for different reasons I have been fiddling with it a lot, trying to fix a problem.
I can tell you that the CPU temps on them mean little. The reason is that my motherboard started off with BIOD version 1.05. With that, I got CPU 100% loaded temps of about 49°.
I then upgraded to BIOS version 1.11, and with no other changes the temp then read 62°.
I'm now on BIOS version 1.13, and the CPU temp is 54°.
The ambient temps are close enough to being the same, so the BIOS has given me a good 13° odd temperature variation.
The rule of thumb, if you can, is that the CPU temp should be no more than ~30° more than room temperature, and no more than 90° at any point.
The Asus motherboard has overheat protection, but they are sometimes unreliable in shutting down in time, from what I hear.