I heard quite the opposite. m2 drives don't need any cooler whatsoever as long the manufacturer sticker in on it. Maybe you need a Mesh case or some better case fans?
I use a NM790 for torrent/JDownloader 2 and the drive never goes above 40C, not even when running CrystalDiskMark.
problem is that my fasterst m2 is between CPU and GPU slots, so it heats by both. Also RTX 5090 will be heat hog too. Maybe if you use it somewhere more far slot or dedicated pci board for m2 it's better, but the best slot which is the hottest...
and it's always like that. Also those gen 5 next gen SSD's heat n trottle like crazy if they go full 10 Gb/s potential.
yes they don't heat if they are not used to the fullest. My 60c m2 is working 2nd year, but it is light usage mainly.
When sequential write at full speed gen 5 SSD's gives 100 gb max at full speed then cache ends and they throttle to 2 gb/s speeds so slower than mine 2.5 which will hold 2.5 until it's death.
here is typical gen 5 SSD m2 scam with 100 gb of cache. You only get 10 GB/s for 100 GB, then only 2 GB/s until 900 GB and then last 100 GB is even 1 GB/s. Also this is variant w/o throttle. It can also throttle and drop further in hot environments.
and 2 GB is the most optimistic scenario. Samsung 990 Pro drops to 1.5 GB/s.