[naggie]

As it happens, I did this morning!

I switched from years old Arctic silver 5 to Noctua NT-H1. It resulted in a dramatic difference. 64c loaded vs 84c -- I now suspect I had an air bubble which may invalidate the initial motivation for the work in the first place :-)

[KennyBlanken]

The first thing I noticed was that your idle temperatures are exceedingly high, especially for an AIO. My air-cooled ryzen 5 idles at around 35c with nearly zero fan speed on a $30 air cooler.

Most AIOs need servicing after a few years- find instructions on how to disassemble yours, clean the water block, flush the radiator, and refill with a deionized-water/glycol mix.