See if you have the latest version of CoreTemp. Mine shows the three cores and reports the same temps that HWmonitor does but I'm starting to think they're not reading the correct sensor. If I fire up Gigabyte's Easy Tune or whatever it's called, it says the CPU temp is the same as Sensor #2 in HWmonitor... which also is much closer to what the BIOS reports for CPU temp. Idling around 35C.

Last night Overdrive wouldn't work at all on my system...it would lock up the machine while the msg indicated Overdrive was reading the information from my PC. I really only want to use it to play with the multipliers in the OS.

I was able to boot and run a few games at 3.4ghz no problem at stock voltage (17x200).