This might actually help. It's not a useless, thin piece of metal like MSI guard.

one things about m2 ssd, is there been a case where it throttling caused by overheating ? if m2 is overheating that it can be also means that 3.5 SSD also prone to overheating as m2 basically is compact version of SSD maybe in 3.5 ssd, the metal casing somehow help ?

one things about m2 ssd, is there been a case where it throttling caused by overheating ? if m2 is overheating that it can be also means that 3.5 SSD also prone to overheating as m2 basically is compact version of SSD maybe in 3.5 ssd, the metal casing somehow help ?

M.2 Drives use much faster/higher powered components than SATA SSDs. SSDs on sata are limited to 6gb/s and it does not take much to saturate that, so they are able to use lower powered components.

Has Guru3D had a review with and without a heatsink? I only recall reading one Anandtech article with 950 Pro under scrutiny. It was quite interesting, but also revealed the heatsink won't do much difference under typical consumer use. Still, that being said, I certainly would have nothing against using one. Keeping electronics cooler always sounds like a good idea, especially when it happens passively.

M.2 Drives use much faster/higher powered components than SATA SSDs. SSDs on sata are limited to 6gb/s and it does not take much to saturate that, so they are able to use lower powered components.

Not completely correct, this is my Samsung 960 evo specs from Samsung Power consumption: Idle (w/ APST on): 40mW Active: Read: Typ. 5.7W Write: Typ. 4.8W But the Sandisk ultra II 480gb tops out at 7.35, i also have a Sandisk ultra II 960gb which Sandisk say uses 4.6w writing but only 2.9w reading. Yes you can get very low wattage ssd`s but i`d say m.2 drives are in the middle compared to available range of ssd`s, my 960evo idle`s at 43c and ive observed about 52c max on the back of my mobo with the side panel off and the area around it feels quite warm but i haven't tried insulating between the two.

still have some heatsinks and thermal glue from the last arctic cooler i bought...

Not completely correct, this is my Samsung 960 evo specs from Samsung Power consumption: Idle (w/ APST on): 40mW Active: Read: Typ. 5.7W Write: Typ. 4.8W But the Sandisk ultra II 480gb tops out at 7.35, i also have a Sandisk ultra II 960gb which Sandisk say uses 4.6w writing but only 2.9w reading. Yes you can get very low wattage ssd`s but i`d say m.2 drives are in the middle compared to available range of ssd`s, my 960evo idle`s at 43c and ive observed about 52c max on the back of my mobo with the side panel off and the area around it feels quite warm but i haven't tried insulating between the two.

Can't really compare two different brands. I'm talking about 960 vs 950/850 Pro etc. 960 uses more power than those due to having a 5core Polaris chip vs the older 3cores. 850 Pro uses less than 2.5w max

This might actually help. It's not a useless, thin piece of metal like MSI guard.

MSI's one has been proven to be useful. Gamer Nexus didn't do their bench correctly. Computerbase.de did one where it clearly shows the M2 can hold max throughput for much longer before throttling