Unlike Core Temp, which only uses some sensors on the CPU, HWMonitor utilizes all hardware sensors and can display all Temperatures, Powerdraws, Clockcycles and even Fanspeeds. It is a great tool for getting a good overview of everything and is especially used by overclockers to look for instabilities. It can be a bit daunting to use for newcomers, due to the shear amount of numbers to look at, if you fold everything out.