Cool data.
Is the PC that is communicating with the temp sensor different than the one the rigged CPU is in?
Can you show a graph of the temperature when you have the rigged CPU fully loaded, and suddenly power off the machine? (Using CPUBurn if it gives a 'cleaner' signal.)
This might give some indication of how significantly RFI is affecting the reading. If there is a sudden step in measured temperature followed by an (exponential?) decay, the step may be attributable to noise causing an offset in the reading. Depending on the steepness of the exponential decay, it might be difficult to tell. (A case where the specific heat of copper does matter, and would, in this case, be advantageous.)
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