PCIe SSd heatsink question

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paulga

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Nov 18, 2015
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PCIe SSd heatsink question

my desktop has Asus X99 Pro/USB 3.1, system is installed to a Samsung 950 Pro 512G NVMe SSD. This ssd is installed to the M.2 Socket on the MB. I observed the operating temperature at idle is already close to 50 degree (C).
For better cooling purpose, I plan to buy a kryoM.2 PCIe 3.0 x4 adapter for M.2 NGFF PCIe SSD, M-Key with passive heatsink.
tumblr_oxihwfgGIt1wdluzmo2_540.png


(0) NVMe runs too hot than sata SSD. will the heat kill the dedicated M.2 slot or the MB too soon?
(1) bandwidth wise, is PCIe 3.0 x4 sufficient for samsung 950 Pro NVMe?
(2) Does this adapter work with 950 Pro?
(3) which PCIe slot should this adapter go in the picture below?
tumblr_oxihwfgGIt1wdluzmo1_1280.png



 
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Ok so that second image defines where you'll put your adapter and according to the description, the place where it suggests to put it is 16_4 slot which is mutually exclusive with the m.2 slots that's already included on the board (and where normally you'd put your m.2 drive if you weren't using the adapter).

Regarding the lane number, this means that if you use the first pcie slot for your gpu, likely 16 lanes are going to get used for it. If you use two gpus, then in 28 lane cpu, first one will use 16 lanes and second 8 as it describes in that image. But I'm not entirely sure what that warning is about. I mean it suggests the adapter will use cpu lanes, and the number of lanes used by the gpu is going to drop if you use the m.2 4x...
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Sedivy

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I wouldn't put it in the second pcie slot, it's a little too close to the gpu. I'd probably go with the third. The specs say it requires a 4x pcie and your mobo specs do say the bottom one will support 4x so should be fine. This is sort of what it should look like:
https://ic.tweakimg.net/ext/i/imagelarge/2001461161.jpeg
except you'd use the third instead of second slot. If you have no fans near the bottom front, your case has a shroud cover that would be right below this heatsink, then maybe second slot is better though you have 4 slots total and even 3rd one should be sufficient distance away. Do you have sli? Can you send a screenshot of the inside of your comp with your sidecover off? How many fans do you have in front or below?
 
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paulga

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Nov 18, 2015
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are you saying PCEIX16_2 is too close to GPU, so either PCIEX16_3 or _4 should work, depending on surrounding airflow?
The case is Enthoo Pro with a CPU 5820K (28 lane ). on bottom there are the PSU (bottom back corner) and two fans (blowing air into case). there are two fans in the front (also inflow). probably _3 and _4 either is good?

tumblr_oxkjalFhlh1wdluzmo1_1280.png



I found a ASUS HYPER M.2 x4 card in the MB box. But also found this note:

tumblr_oxkkh06Bvp1wdluzmo1_1280.png


How to understand this note? How would using this card affect system performance? I want to lower the temperature so the system runs longer


 
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Sedivy

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Ok so that second image defines where you'll put your adapter and according to the description, the place where it suggests to put it is 16_4 slot which is mutually exclusive with the m.2 slots that's already included on the board (and where normally you'd put your m.2 drive if you weren't using the adapter).

Regarding the lane number, this means that if you use the first pcie slot for your gpu, likely 16 lanes are going to get used for it. If you use two gpus, then in 28 lane cpu, first one will use 16 lanes and second 8 as it describes in that image. But I'm not entirely sure what that warning is about. I mean it suggests the adapter will use cpu lanes, and the number of lanes used by the gpu is going to drop if you use the m.2 4x adapter, but considering you have 28, even if you used sli, that would be 24 lanes and you'd have enough still. Not sure about the warning but I think you should be fine with your adapter in the 16_4 slot, especially if you're only using a single gpu. I suppose it also matters how many other adapters you may be running which would interfere with this calculation.
No, I see. The 16_4 slot is 2.0. Which would limit the bandwidth of the adapter which is max 32Gb/s. I guess in that case you might have to put it in 16_2 slot assuming you do not have sli. But in that case it mentions with wifi and usb3 enabled, it automatically runs at x1 mode (?) in which case that would be a bad slot as well. Can't put it at 16_3. Hmmm but then why give you an adapter at 32Gb/s that you can't run at that speed without sacrificing gpu? I'm not getting something right here. Wait for someone else more familiar with this to chime in.
 
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