Any in the new Torrid Zones; sweating as you read this? You're in one.

Those little holes in the bottom screens; Many of these teensy air inlets are blocked by ID tags:
Best to deface the labels, clear ALL the holes. Any handy pointy object.
Also best to, periodically run an old toothbrush across/into the lot.
(If you wet a finger and run it under the screen/case bottom--and it comes up with fuzz on it? You're over-due.)

After I did this, a while back--noted I could decrease fan speeds and get back in my preferred temp-range:
fan-speeds such that GPU/and GPU Diode don't ever creep much over 130F.

MTBF--it's not just for breakfast anymore; it's The Law.

PS: that Upgrade fixed Something--all still copacetic at Day 8+

HTH