M.2 with dual GPU's

[bbmore6]

I have an ASUS Prime X-370 with Ryzen 1800X; 32GB GSkill ram; (2) MSI 1080 GPU; with multiple (8) different drives (2) Optical/DVD Burners; (3) SSD and (3) HD. I just added an M.2, to replace one of my SSD's (GT--GameTime); the others drives are split between Boot, Personal; and Business. As the M.2 was installed, it compromised by GPU's with dual monitors. Do I need to remove (2) of these drives (which I can do, as things are getting copied to M.2 as I type this) to get my GPU's with dual monitors up and running again? I don't understand enough about the various PCIe lanes--just something I came across that mandates having (2) of the SATA 3 ports open. Note--the M.2 is NVMe.

 

[Eximo]

X370 with a Ryzen 1800X should have:

PCIe 3.0 16x out of the CPU directly to the two PCIe x16 slots. 8x/8x mode. PCIe 3.0 4x lanes to an NVMe M.2 slot. (Not quite clear to me if those can be redistributed)

8 PCIe 2.0 lanes coming from the chipset.

Some of the SATA ports are sharing lanes off the chipset. And boards with multiple M.2 slots usually consume SATA ports to be used.

I suspect you've exceeded your lane count. Time to get some bigger drives and consolidate.

 

[bbmore6]

X370 with a Ryzen 1800X should have:

PCIe 3.0 16x out of the CPU directly to the two PCIe x16 slots. 8x/8x mode. PCIe 3.0 4x lanes to an NVMe M.2 slot. (Not quite clear to me if those can be redistributed)

8 PCIe 2.0 lanes coming from the chipset.

Some of the SATA ports are sharing lanes off the chipset. And boards with multiple M.2 slots usually consume SATA ports to be used.

I suspect you've exceeded your lane count. Time to get some bigger drives and consolidate.

That's what I figured--consolidating and removing some of the drives. Is it slot specific for the X370 board and1800X? Meaning do I have to "free up" specific SATA ports?

 

[shmoochie]

the PCIe 3.0 4x lanes can be distributed to two SATA devices, but it will limit the M.2 to two lanes. The 16 lanes for the gpu are reserved for the gpu though, so I don't see how adding an M.2 would affect your gpu?

Here is an excellent visual to your pcie lanes if it helps: https://rog.asus.com/articles/technologies/your-guide-to-the-ryzen-am4-platform-and-its-x370-b350-and-a320-chipsets/

 

[bbmore6]

The diagram linked is helpful--still a vague understanding. As it shows "up to 6 x SATA" and I have all 8 ports on the MB being used currently, is it possible that this is what's tying up the PCI Express 3.0 for the M.2 drive?

 

[bbmore6]

So, moving files from an SSD--reloading NVidia drivers--appears all is well. Thank you all for the input.