In short, I noticed about a week ago that my iMac was “crashing” during video file transcoding. Basically I was trying to edit some gopro clips. When I looked closer I noticed that the “% CPU” in activity monitor was at 570+ whenever I transcoded any video files using either gopro studio or FinalCut Pro X. (If I manually stop transcoding the CPU % drops to normal levels) Also the iMac fan would ramp up to ludacris speed and eventually either the app would quit or the iMac would shut down and reboot. The failure reports make no sense to me but I suspect the GPU is failing and the CPU is taking on the entire transcode load.
My question is could this be an issue where just opening the iMac up and removing/cleaning and reattaching the GPU chip with thermal paste may solve the overheating?
any insight is greatly appreciated