Help needed with M.2 drive and questions

[Yoshiii335]

I have a Asus ROG Swift B650E-E mother board.

I have the main os drive M.2 installed on the M.2 1 and I installed a 2nd M.2 drive( C in the diagram) into M.2 2 but it is not working. You can see it in the bios and hardware profile but it doesn't show up in my pc or when I want to download something, it doesn't give me a choice of the 2nd drive to use. What could be wrong?

Also when it says that M.2 3 is used(the second PCIE Gen 5 slot) that the first Gen 5 slot runs at x8. That means the video card will only run at x8 if I install a M.2 drive into M.2 3 space?

 

[DarkDreams]

Go to Disk Management (right click on the start menu) and see if the drive appears there. If it is unallocated you need to create a new volume and assign a drive letter to it.

 

[dirtyferret]

Also when it says that M.2 3 is used(the second PCIE Gen 5 slot) that the first Gen 5 slot runs at x8. That means the video card will only run at x8 if I install a M.2 drive into M.2 3 space?

correct but that won't even impact the RTX 4090, it's still a ton of bandwidth


The additional bandwidth of PCIe 5.0 means that devices may be able to achieve the same throughput while using fewer lanes, thus freeing up the number of lanes available. For example, a graphics card that used to require x16 bandwidth to run may now run at the same speed with x8 lanes, thus freeing up x8 lanes for use. PCIe Gen 5 effectively allows these lanes to become more available for further additions via PCIe slots.

 

[thewan]

The Ryzen 7000 only has 8 lanes for NVME. With slots 1 and 2 already using 4 lanes each, the third lane will have to share with one of the PCIE x16 lanes, splitting them up accordingly.

 

[Yoshiii335]

The Ryzen 7000 only has 8 lanes for NVME. With slots 1 and 2 already using 4 lanes each, the third lane will have to share with one of the PCIE x16 lanes, splitting them up accordingly.

So if I use up all 4 NVME slots, it will cut down bandwidth on other stuff?

 

[eidairaman1]

So if I use up all 4 NVME slots, it will cut down bandwidth on other stuff?

Read your motherboard manual

 

[evernessince]

correct but that won't even impact the RTX 4090, it's still a ton of bandwidth


The additional bandwidth of PCIe 5.0 means that devices may be able to achieve the same throughput while using fewer lanes, thus freeing up the number of lanes available. For example, a graphics card that used to require x16 bandwidth to run may now run at the same speed with x8 lanes, thus freeing up x8 lanes for use. PCIe Gen 5 effectively allows these lanes to become more available for further additions via PCIe slots.

The 4090 only supports PCIe 4.0 so it'll run 8x PCIe 4.0. That's equal to 16x PCIe 3.0. Haven't seen the 4090 tested on PCIe 3.0 x16 bandwidth but given that the 3090 looses some performance with that level of bandwidth it's safe to assume the 4090 will see at a very minimum some performance loss when limited to x8.