Motherboard and two m.2 storage options.

Jul 5, 2018
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Hi. Long time reader, first time asker. I haven't done this in a long time, but I'm building a new computer, and I haven't been able to figure out the answer myself. The Motherboard Gigabyte H370 AORUS GAMING 3 WIFI (rev. 1.0) has two m.2 slots. I plan on putting my OS on a Samsung EVO 970 m.2 pcie gen3.0 x4 nvme in the first.

The second m.2 slot will accept either m.2 sata, or pci-e 3.0 x2 nvme. I will be using whichever I pick for frequent backups and otherwise light storage, and would like to use the slot on the board so I don't have to mess with the extra cables. I'm looking at either SAMSUNG 860 EVO Series M.2 2280 500GB SATA III 3D NAND Internal Solid State Drive (SSD) MZ-N6E500BW or the other choice is Corsair Force MP300 M.2 2280 480GB PCI-Express 3.0 x2, NVME 1.3 3D TLC Internal Solid State Drive (SSD) CSSD-F480GBMP300.

If I went with the SATA I doubt I'd notice a huge difference speedwise, and that really isn't an issue, but according to the mobo manual, it looks like if I use the second slot for m.2 sata, I'll lose a sata port. This is really not ideal because I plan on putting a number of 3.5" hard drives in the build and don't want to lose the one sata header if I can avoid it. I will be needing it.

So my first question is: If I use the Corsair Force MP300 x2 in the second m.2, it does not look to me like the pcie x4 expansion slot will become unavailable; is this correct? I don't want to lose the use of the expansion slot if I can avoid it, because I will need to use it sometime in the future.

My second question is: if the above is correct, is there any other good reason not to use the Corsair x2 nvme card? Since I'll just be using it for storage and backups, I won't be using it a lot, but some of the files are going to be pretty large. Do you think the heat generated would be a big deal? Are there any other drawbacks you can think of?

I'd appreciate your input; what do you think?
 
Solution
1. According to the Gigabyte H370 AORUS GAMING 3 WIFI manual, the M.2 connectors and the PCIe expansion slots do not share any PCIe lanes. All PCIe expansion slots will still be available.
2. There is no good reason not to use the Corsair x2 NVME SSD other than price. NVME SSD's cost a bit more than Sata SSD's. If you will be using the Corsair x2 SSD for storage and backups, heat will not be a problem. The Thermal Guard on the first M.2 slot is probably not necessary either, it's more for show.
1. According to the Gigabyte H370 AORUS GAMING 3 WIFI manual, the M.2 connectors and the PCIe expansion slots do not share any PCIe lanes. All PCIe expansion slots will still be available.
2. There is no good reason not to use the Corsair x2 NVME SSD other than price. NVME SSD's cost a bit more than Sata SSD's. If you will be using the Corsair x2 SSD for storage and backups, heat will not be a problem. The Thermal Guard on the first M.2 slot is probably not necessary either, it's more for show.
 
Solution


Thanks. That's awesome news and what I was hoping. I really appreciate the confirmation.