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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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Almalinux on my 2012 quad Mini. Just finished copying over 140 million files to a 4tb Linux-formatted T7 SSD to make it closely mirror the web server that I lease, which was quite an ordeal! Still trying to install Almalinux on a 2018 Mini but the 2012 feels so fast, it might be all I need.

Interesting that it shows 8 processors but, of course, the Mini only has 4. My understanding is that Linux sees this as 8 "logical cores" where 4 represent turbo boost. I guess that's also why it shows 3.6ghz when the real chip is actually 2.6ghz.

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