Okay, it's the feedback time!
I tried first to put this into M.2_1 socket. That is the one that is under the heatsink.
So... initially, I thought that the heat conducting stick is something to throw away so I put the SSD under that heatsink without any conductor.
That may have even been fine, except there is a 1080 Ti right on the top of it. I was experiencing system freezes. It turned out, the drive was reaching its top temperature 70°C. That wasn't good. Next step, I added the heat conductor.
Hey, it wasn't in the best shape but that got things going. The temperature was in the range 63 - 68°C, so that became workable with but gee, seriously? I watched the temperature and it seemed to fluctuate together with GeForce's. So... next iteration. I relocated the stick to the M.2_2.
That was nice. Stable temperature around 55°C over a few weeks. It took me some time to remove the heat conductor, which I suspected was only keeping the heat instead of letting it be released. And that was right.
Stable temperature 53°C. That is it. That is what I have got now.
By the way, that cooler is sucking the air in so my thought is, in some wild theory, it might suck in the SSD and damage it. But things are really tight in there, I'm not up for installing the metal part that is supposed to keep the SSD straight up.
Keep exploring, keep innovating, keep creating