For core temp they are inside the CPU, for system near the NB and first PCIE slot, ( YOU DO NOT want to cool the tempature sensor, you want to cool your componants, the temp sensors are there to give you a guide to protect the componants, if you adjust your fans to cool the sensor and not the componant your defeating the purpose. It would be like wanting to cool your house, and tapeing a icecube to the thermostat, sure the reading would be lower, but the house would still be hot, concentrate on your CPU, Northbridge, and total system air flow.