How to measure a CPU overheating process when in Idle Mode?

Every time my PC is idle for an hour, I retu to find the fan at maximum speed and the CPU at 51-52 degrees. It's Windows 7 on an 8150 octocore from AMD. The task manager shows that two of the cores were at 70% usage and the rest are at about 5%, until the moment where i press a keyboard button, where the processes go all back to 5% and the processor cools down.

To find the culprit process, i need to make a graph of the most active processes of the PC, which i can consult when i retu. Do you know a program which can help me?

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