Comment Re:bad fan? (Score 1) 835
When your CPU overheats the clock multiplier decreases and the voltage drops. This makes your CPU temporarily slower, but it still has the same amount of work to do. This would make all of the processes spike, but instead of them doing more, they are doing the same ammount on a temorarily slower CPU. The spikes in this case should appear to oscillate as the CPU will cool below the throttling threshold, return to full speed, heat back up, then compensate by dropping down again.
The fan may not even be dead. It's entirely possible that a quick snort from a can of air could fix your problem.
Hope this helps