What can cause a cpu overtemp apart from the obvious.

      I have played about with my Mac Pro 1.1 for three days now because it cut out all the time with the cpu overtemp LED's coming on. I have taken it apart and cleaned out the dust about 4 times now.Can this be caused by other things, for example, overheating of the pcie, or having too many drives and peripherals on. I had 4 drives, 3 usb's loaded, a nvidia 7300gt for mac osx and a GTX 460 for windows and 4 gig of memory in place when it all started. I did notice that the pcie fan really kicked in on some windows games.
      I have now taken out the gtx 460, and replaced it with the inferior ATI 4850, 1 gig of ram along with the riser and am thinking of taking out one of the hard drives. It seems to be working fine now. Could it have been bad memory or just drawing on the power supply too much?

I would run the Apple Hardware Test. It could be a failed fan or sensor.

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