Question Can a Hiksemi M.2 SSD Cooler Heatsink - HS-RADIATOR-MH1 fit into my Precision 3630

Your MoBo has M.2 PCI-E 3.0 (Gen3) slot, making the 990 Pro PCI-E 4.0 (Gen4), waste of money.

Also, the very store link you liked for SSD, there is heatsink variant as well, which actually is 5 bucks cheaper than the one without heatsink. So... why didn't you buy the 990 Pro with heatsink?

The Hiksemi heatsink may not fit, since on the MoBo, there is one microcontroller chip, which would be just below M.2 drive. Hiksemi heatsink has backplate and it may interfere with the microcontroller chip on the MoBo (e.g doesn't fit).

Money and performance wise, PCI-E 3.0 (Gen3) drive, e.g Samsung 970 Evo Plus, up to 2TB (since that's max what MoBo supports), would've been much better.

Some numbers;
990 Pro - max read: 7450 MB/s, max write: 6900 MB/s
PCI-E 3.0 - max bandwidth: 4000 MB/s
970 Evo Plus - max read: 3500 MB/s, max write: 3300 MB/s

So, if you go with 990 Pro, what you can get, is about half what the drive can actually deliver. But if you go with 970 Evo Plus, you can get full what drive is able to deliver.
 
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Your MoBo has M.2 PCI-E 3.0 (Gen3) slot, making the 990 Pro PCI-E 4.0 (Gen4), waste of money.

Also, the very store link you liked for SSD, there is heatsink variant as well, which actually is 5 bucks cheaper than the one without heatsink. So... why didn't you buy the 990 Pro with heatsink?

The Hiksemi heatsink may not fit, since on the MoBo, there is one microcontroller chip, which would be just below M.2 drive. Hiksemi heatsink has backplate and it may interfere with the microcontroller chip on the MoBo (e.g doesn't fit).

Money and performance wise, PCI-E 3.0 (Gen3) drive, e.g Samsung 970 Evo Plus, up to 2TB (since that's max what MoBo supports), would've been much better.

Some numbers;
990 Pro - max read: 7450 MB/s, max write: 6900 MB/s
PCI-E 3.0 - max bandwidth: 4000 MB/s
970 Evo Plus - max read: 3500 MB/s, max write: 3300 MB/s

So, if you go with 990 Pro, what you can get, is about half what the drive can actually deliver. But if you go with 970 Evo Plus, you can get full what drive is able to deliver.
Thank you so much for this detailed answer.
Unfortunately, I already bought the Samsung 990 Pro. My only concern is it to go overheat,

For the Hiksemi heatsink, I ordered it but I still can cancel my order (I guess).

- Should I cancel this order?
- If yes, should I just install the Samsung ssd without any thermal pads/heatsink ?

- Does a Gen4 ssd running on a Gen3 slot, make it cooler as it isn't running in full speed? and thus doesn't require a heatsink?

- If I must buy a heatsink, What do you recommend?
 
- Does a Gen4 ssd running on a Gen3 slot, make it cooler as it isn't running in full speed? and thus doesn't require a heatsink?
Given that NAND cells heat up when they write data on themselves and you're limited to half what drive is capable of, i'd say you'd be fine without heatsink.

990 Pro 2TB thermals, review: https://www.techpowerup.com/review/samsung-990-pro-2-tb/8.html

In that review, SSD at full write performance and without heatsink wet up as high as 80C. However,
Due to the compact form factor, M.2 drives usually lack the ability to actively cool themselves, typically having to rely on passive airflow instead. All vendors include some form of thermal throttling on their drives as a safeguard, which limits throughput once a certain temperature is exceeded.
And of course the half-speed limitation as well.
 
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