Which software can be used to measure the laptop heatsink (not cpu) temperature near the fan? Are there any alternate methods to measure the heat sink temperature (experimental or software based or by calculation)? Any website which might provide me charts/graphs/relations between cpu temperature or fan speed and heat sink temperature? Just to estimate, what is the general heatsink temperature? In my case, the cooling fan starts running when cpu reaches 66.8 degree C, so what can the heat sink temperature be after the fan has been running for say half an hour?