LogFAQs > #932956550

https://www.hwinfo.com/download/

download the one in the first column, install, run.
a lot of things will show up that you won't recognize. the important one for temperature purposes are sections 3 and 4 down.

get the numbers for CPU 0 in the third section and CPU in the fourth. specifically, the ones in the third column, Maximum. jot that down.
open Overwatch, put it in Windowed mode. make sure you can see those numbers.
keep playing until it freezes.
recheck the numbers, same column (Maximum). jot that down.

if Overwatch is causing a heat issue that'll be the easiest way to check since we'll know how much it's pushing your system.

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"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.