It will be the fan that changes as the CPU workload increases.
Probably Fan 0. And 4500RPM at idle isn't good... not good at all.
Your cooler is keeping your CPU out of the 'real danger' zone but its working much hard than should be necessary.
Lets take everything (CPU and GPU) back to stock speeds and take some more temp measurements.
63C is OK for an max OC'd HD 4770 video card. http://www.techpowerup.com/reviews/Powercolor/HD_4770_PCS/33.html