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Running Linux on intel iMacs:
I suggest two temperature apps you might add:

smcFanControl
pSensor

I overheated the GPU running MX streaming a movie on my iMac 10,1

Psensor shows the temperatures - TGOD ..being the GPU.
smcFanControl allows you to adjust fan speed n when according to temp levels.

(Im repeating myself in here in the hope it helps some avoid the situation I found myself in - ie having to use keys P,R with Option n Apple key to get a successful boot up.)
 
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