Well this is not board related, coretemps are always higher then CPU temps. The latter is read out by a sensor on the mobo ( and can sometimes be miles off the real value) The coretemps are readout via the CPU sensors itself (which Realtemp analyses and corrects according the correct Tjcasemax and other stuf ) Sadly Intel has had issues with correct readouts since the Core 2 Duo CPU's. If ya want to be 100% sure grab Uncleweb here on XS, he's the developer of Realtemp. Or grab the latest Coretemp version and cross check values. But I'm pretty sure you got a hothead running there or ya fan doesn't cut it and/or due to the lapjob the pressure of the cooler isn't 100% anymore