I baught a Kingston KC3000 2TB without heatsink put it in Asus TUF Gaming A15 (FA507NU).
It seems to be on the hotter side. Seems to exceed 70C quite easely, copyd over like 80GBs and reached around 72C. Looking at
The max operating temp of that drive is 70c. That you are hitting that means the SSD is probably throttling.
I'm not sure how effective pads would be without a heatsink to dissipate the heat. Is there a heat sink model for that drive? Would it fit in the laptop? Is there much clearance above the drive when looking at it that it might take a heatsink?
This is the problem though with laptops. Very defined thermal envelope with very little scope.
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Speed equals heat in a laptop.
You have to decide what you want.
Most people can not tell the difference between a NVME PCIE 3.0,PCIE4.0 or SATA SSD in most common tasks. Only in benchmarks and large file copy's. In a laptop in limited cooling after a few gigs all of them will start heating up and slowing down.
If you copy lots of sequential data (80 GB) to any of them they will get hot in a laptop.