I have one in the post aswell, also have some spare Gelid thermal pads to try on it too, had to order direct from EKWB, ive seen a couple of similar heatsinks from china but they use silica gel or gap filler pads which doesn't transfer much heat so makes them pointless

Someone explain me why m2 drives get so hot. Isn't it just another SSD?

Its mostly the controller, and the rest get hot because of faster speeds and smaller size. Regular SSD case is a sort of heatsink for the chip. I have a program that monitors hard drives and SSDs: 2.5" Samsung 850EVO 250Gb, Used for System only, no downloads or anything like that, maximum registered temperature: 52C, Current 35c 2.5" Samsung 840EVO 750GB, Steam/Games only. maximum registered Temperature: 57C, Current 35C 2.5" Two Samsung 840EVO 120GB SSDs both have identical temps, used for Games and sometimes cache for encoding, maximum registered temperature: 49C, Current 32C M.2 Corsair Force MP500, no cooler,empty will be used for windows, used for benchmarks and copy speed test, no cooling maximum registered temperature: 70c, Current : 56C My mechanical drives have muich lower temps, even 2.5" SSDS are hoter than HDDS 1Tb SeaGate Barracuda 7200.12, 7200RPM, used as Downloads kill temp drive, everything I download be it torrent, usent or files goes downloads there, uncompressed and than copies do downloads drive, Highest registered Temp: 53C but it was probably during full format or outside the case without fans, average daily temp inside the case is 29C-33C and its the most working HDD 2Tb Seagate Barracuda 7200.12, 7200RPM, used as downloads drive where everything is copied to after its downloaded to 1TB kill drive, highest registered temperature: 41C, Current: 34C 3Tb Seagate Barracuda 7200.12, 7200RPM, used as video archive, highest registered Temp: 44C, Current:33C 8Tb Seagate Archive HDD v2, 5500RPM, another archive for videos, games, emulators, aduiobooks and the such, highest registered Temp: 55C, Current: 31C, but again the 55C temp is probably when it was used in its external case shell, 2 days ago i copied all 5TB out of it, formatted it and copied to it again and the highest it went was 34C Im using Define R5 case with front HDD cage and two 140mm fans blowing at HDDs, about 750 to 1100rpm The System 250GB ssd and the 750GB games SSD are installed on the rear side of the motherboard tray between motherboard tray and motherboard with CPU on one side and 2 layered sound proof door on another without any cooling going there

Guys, which one should I get? As I previously mentioned I found 2 on ebay

Honestly won't matter much. Copper is a better material but as you said it's cheaply machined. Won't be the best on dissipating air IMO. Do what i did. Get 2 of the 1st link with quality thermal pads and sandwich them. http://cdn.overclock.net/7/76/761674e4_pTowNg0.jpeg http://cdn.overclock.net/e/e2/e26052e2_j7fwIoF.jpeg That will achieve the best results.

Honestly won't matter much. Copper is a better material but as you said it's cheaply machined. Won't be the best on dissipating air IMO. Do what i did. Get 2 of the 1st link with quality thermal pads and sandwich them. http://cdn.overclock.net/7/76/761674e4_pTowNg0.jpeg http://cdn.overclock.net/e/e2/e26052e2_j7fwIoF.jpeg That will achieve the best results.

Thanks for replay, but in the mean time I already ordered the 4mm copper, I will see how it works, you see I was thinking that no matter what type I order they work trough thermal pad, so even if the copper one is not super smooth at the bottom, in this case it doesn't matter, it only matters on direct contact if its good I can always get the 2mm one for the bottom side or the aluminum which is dirt cheapo right now, even the black one wen down in price today from 10$ to 6.50$. Also you installed them wrong, the first seller that sells the black one has comment on his listing saying that thermal pad should be cut and used to achieve contact between controller and the heatsink because its lower, the memory chips should be direct contact, using thermal pad on the whole heatsink lowers its performance.

Also you installed them wrong, the first seller that sells the black one has comment on his listing saying that thermal pad should be cut and used to achieve contact between controller and the heatsink because its lower, the memory chips should be direct contact, using thermal pad on the whole heatsink lowers its performance.

Not true. NAND sits at 50-60c without active cooling. NAND surface is not flat at all so you want a thermal pad for those. Putting direct contact will not be near as effective. BTW seller gives a garbage tape, I wouldn't use it for any sort of thermal transfer. As i said my temps before were high 60s and now they are around 38c~ from benchmark Henceforth the install is correct.