iMac restarts after 5 minutes of the heavy load of CPU/GPU and noisy fan

Hello

My iMac (late 2012 if I remember) restarts when under heavy load for a while.

I work a lot with Final Cut Pro X.

Whenever I have add clips in an event, Final Cut allows you to copy and then transcode and analyze the clips, and this task's CPU/GPU intensive (Final Cut Pro X uses OpenCL, where CPU/GPU). After a few seconds, the iMac fan begins to be really strong and seems to reach its maximum speed.

Then, after a few minutes of this heavy burden, the iMac simply restarts, and the fan slows down and stop. After the reboot, everything is back to normal, with the exception of the warning illustrated by Mac OS X, who said that the closure was not planned.

I'm sure that this behavior is not normal. I don't see why a computer should reboot/crash when under heavy load.

Note: you can also, to transcode some clips or movies I used the excellent software called Handbrake, using CPU only encoder ffmpeg, and I don't remember having accidents even if the CPU has been loaded and FAN running loud too. So maybe it has something to do with GPU?

How can I understand what is happening?

Thank you very much.

Thomas

First try to reset the SMC reset management system (SCM) controller on your Mac - Apple Support

If continuous reboot to run the Apple Hardware Test mode extended using Apple Hardware Test - Apple Support

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