Sometimes it's just the stupid little victories...
I've been upgrading the same computer since 1992, i.e., I've never purchased a whole computer after that, but obviously everything has been swapped out multiple times.
It's basically the cadillac of 2012... an AMD FX-8350. At one point, it was liquid cooled - not for performance but for quiet.
TWO liquid coolers failed over the years, and I just stopped caring, so now it has a traditional cooler on it. A couple weeks ago, I noticed it was running pretty hot, throttling itself, and the CPU fan was working hard and loud.
My first solution was to use AMD Overdrive to cut the CPU frequency in half to 2GHz, so it didn't cook itself. Temps improved, but I really noticed the slowdown.
Tonight, blew the whole case out - SO MUCH DUST - and discovered two of the 120mm inlet fans needed lube. Pulled the CPU cooler and discovered dust packed into the fins immediately below the fan. This stuff was dense and hard to blow out... covering almost the entire area between the fan and the cooler fins. Fresh paste in between the cooler and CPU for good measure.
With everything back together, CPU temps are CRUSHED to just above ambient. At half speed and choked flow, my idle temps were 20°C higher. Can only conclude the CPU cooler was little better than passive with the blockage between fan and fins.
All this really means is that I'm more confident that I'll make it to the Win 10 end of support in October... Don't meet Win 11 hardware requirements...