I use the same in my laptop, but the 500 Gib version. Works really well.
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Which app is the devices -sensors - system information?
I have the Samsung 970 EVO Plus 250GiB. So basically the same thing?
Just out of curiosity, is your computer dedicating 2 PCIe rails or 4 PCIe rails to the NVME?
On hardinfo, go to PCI Devices on the left column, then scroll through the entries until you find the Samsung Electronics Co Ltd NVME SSD Controller. Then see what the Link Width is, x2 or x4
Since you don’t have cooling issues, it would be interesting to see.
Pudge
we do have this on the ISO on the panel 
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Hey out of curiosity what performance do you get with your XPG 8200 PRO 1TB drive?
I’m using Disks (package gnome-disk-utility, more details here: https://askubuntu.com/a/87036/230104) and have got the following results:
I’ve run the test with the default settings of 100 samples of 10MB each.
I only use it for:
[elloquin@elloquin-elloquin ~]$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
└─sda1 8:1 0 931.5G 0 part /home
sdb 8:16 0 931.5G 0 disk
sdc 8:32 0 931.5G 0 disk
└─sdc1 8:33 0 931.5G 0 part
sdd 8:48 0 931.5G 0 disk
sde 8:64 0 9.1T 0 disk
├─sde1 8:65 0 2.1T 0 part /run/media/elloquin/cb777eb9-06f5-46ed-bbdc-1d4ec13a6cc1
└─sde2 8:66 0 3.5T 0 part /run/media/elloquin/dead8596-8f16-4f6a-8ea1-6fbed5210e63
nvme0n1 259:0 0 232.9G 0 disk
├─nvme0n1p1 259:1 0 1000M 0 part /boot/efi
├─nvme0n1p2 259:2 0 216G 0 part /
└─nvme0n1p3 259:3 0 15.9G 0 part [SWAP]
[elloquin@elloquin-elloquin ~]$
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OK, I am officially jealous of your temps.
Pudge
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whoa! crazy difference.
Yeah, I’m quite impressed with the SSD since I’ve had it.
NVME drives dont actually need heatsinks and you want the Flash memory itself to run a bit on the hotter side for performance reasons. The actual controller on the drive might need it though and if youre in a VERY hot environment your flash chips might get a little hotter than optimal but heatsinks on the actual flash are 100% useless in most cases.
TL:DR Your NVME is fine unless you live in an oven / hammer it REALLLLLLLYYYYY hard then the controller might need cooling.
Quick bit on why you want your NVME to run hotter
Data retention generally isnt an issue during non write situations, the temps in your case should be more than enough for good data retention. You do want the drive to get hotter during P/E so that it doesnt degrade the cell as quickly
My temps on my Ryzen X570 motherboard for m.2 drives run about the same as each other even though one has a heat sink with pretty thick cooling pad compound? This is a gaming board and temps around 37 degrees idle. So they run hotter than @BONK.
New boards now with Pci-e 4.0 are faster again!
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Keep in mind with the that graph about GEN4 M.2 that is theoretical and does not account for protocol or filesystem overhead. Likely most drives wont reach even close to that except in ideal situations.
Some people buy into that thinking theyre going to get 32/64gbs and are confused when they dont so just wanted to put that out there
No worries i understand the theoretical and the specs. If it’s twice as fast theoretically than the theoretical speed of PCi-E 3.0 then it’s still twice as fast. The fact is it’s fast compared to hard drives and sata ssd. If you don’t have the hardware you can’t get fast! 
I want ALL your secrets! 
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Mind you CURRENTLY, 4.0 chipsets also use WAY more power and generate WAY more heat than their 3.0 counterparts to the point that almost every 4.0 drive that has been released was forced to include heatspreader/heatsink (I only know of 1 so far that doesn’t). Also the current most common chipset (phison E16) is only usually maxing around 4200/3500, compared to the top 3.0 drives maxing around 3500/3000, so there isn’t hardware YET capable of actually taking full advantage of 4.0.
Just thought I’d throw in some thanks in general to those posting in here. Just what I like - learning some new things without a lot of ‘big digs’ to get it! For instance - I did not know of hardinfo at all (and it was installed!) and that particular use of disks was new to me as well.
As for the gen 4 drives - Most of what I knew about them was that I wanted one! Every test I have seen of them made clear that sustained high-volume use led to heat-related throttling quite easily… but they can certainly go until then!