Question Will I be losing effeciency if I use both available m.2 slots on my motherboard?

Nov 18, 2019
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I am in the process of building a gaming PC and am very new at it. I'm not sure I understand it correctly but I came across something that could potentially be an issue.

I was considering going full SSD for storage (and 2TB HDD for backups and personal pictures/video) since I'm mostly going to be gaming on the rig, but I'm not sure how to optimize my PCIe lanes.

My processor is an i7-9700k and Intel had this to say regarding PCIe:
PCI Express Configurations: Up to 1x16, 2x8, 1x8+2x4
Max # of PCI Express Lanes: 16

The motherboard is the ROG Strix Z390-E.
Asus's product website had this to say about PCIe support for the mobo:
2 x PCIe 3.0 x16 (x16 or dual x8)
1 x PCIe 3.0 x16 (max at x4 mode)
3 x PCIe 3.0 x1
1 x Type 2242-2280, supports SATA & PCIe 3.0 x4 modes
1 x Type 2242-22110, supports PCIe 3.0 x4 mode
6 x SATA 6Gb/s port(s)
Note: When the M.2_1 Socket 3 is operating in SATA mode, SATA port 2 will be disabled.

I was only planning on buying and installing one GPU (2080 Super, PCIe x16) but starting out with one NVMe (1TB, PCIe x4) for booting and throwing other software on there and then purchasing a 2TB NVMe (that's an additional x4 lanes) at a later date strictly for dumping games onto it.

Finally, my question(s): can I use a dual-NVMe setup on my motherboard without losing efficiency in performance of the SSDs or my GPU? Should my boot NVMe be in the slot closest to my CPU or does location not matter as much? Do I still have enough support to install a third non-NVMe SSD without having to worry about the lanes I have available? What if I wanted to throw another GPU on there?

That last question isn't pertinent to me at the moment, but maybe some years down the road when I upgrade I may consider that option and I'd just like to be better prepared. The way I understand it, the 9700k will provide a full x16 lane support for the GPU. About the rest, I'm kind of out of my element. I feel as though I'm right there, I just need a little guidance in understanding this. If someone could break down the math involved that would be GREATLY appreciated. Thanks in advance!
 
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Finally, my question(s): can I use a dual-NVMe setup on my motherboard without losing efficiency in performance of the SSDs or my GPU? Should my boot NVMe be in the slot closest to my CPU or does location not matter as much? Do I still have enough support to install a third non-NVMe SSD without having to worry about the lanes I have available? What if I wanted to throw another GPU on there?

  1. Yes dual NVME will be fine without issue.
  2. All NVME are equal, there’s no difference in which slot you use.
  3. State your motherboard model for clarification.
  4. GPUs share the 16 lanes given to the pcie slots available. They don’t have anything to do with lanes for NVME. 2 GPUs would each operate with 8 lanes.
 
Reactions: NinjaTheKenny
Nov 18, 2019
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It's a z390 board. Sorry, I thought I mentioned that. I'll edit the original post so it's up there. Also, wow! Thanks for the quick reply. This is my first time posting and I wasn't sure what kind of wait time to expect.
 
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i don't think you can run both at pcie 3.0x4

Intel® Z390 Chipset :
1 x M.2 Socket 3, with M key, type 2242/2260/2280 storage devices support (both SATA & PCIE mode)*2
1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (PCIE 3.0 x 4 mode)

so, one can get max performance, the other, not so much, but it will still be plenty fast

well, actually i was probably wrong, you have 2 3.0x16, so use one of those for your card and other for a drive, then use the other pcie 3.0x4 for the other nvme
 

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