6900XT reporting PCIE x 8 4.0 in GPUZ

[JENK9NS]

I just noticed that my 6900XT is only using 8 lanes on the x16 slot. Not sure how long its been like this. I know it shouldn’t have a noticeable affect on performance, I’m just wondering why it is doing that. It is not my intention to limit it to 8 lanes.

I have Gigabyte X570 Aorus Ultra, 5900X, SN850 PCIE Gen 4.0 NVME m.2, 2x SATA SSDs, 4x 8GB DDR4.

6900XT is in the first slot of the board, highest/closest to the CPU.
Gen 4.0 NVME is in the first slot of the board, highest/closest to the CPU.

I don’t think that just a single 4.0 NVME drive limits your x16 slot on X570 platform.

[GigaBusterEXE]

Try clicking on the question mark besides the bus interface and start the render

Other than that is there any other PCI-e cards or m.2 ssds or wifi cards installed

What are the bios options for bifurcation set to

[BigBodZod]

I think both the top two slots can be adjusted for bifurcation, see if you have this enabled as described above and see if the BIOS is only allocating 8 PCIe lanes to the top slot.

[MisteryAngel]

This is normal basically when the gpu sits at idle.
Run a gpu benchmark like valley or a game or whatever.
Then the gpu should jump to 16x.

power saving thingy.

[JENK9NS]

In Bios the x16 is set to “Auto” I think the other options were like 2x8 or 4x4 and something else.

I ran Timespy at 2690MHz and 390W and refreshing GPUZ still showed x8 4.0.

[GigaBusterEXE]

Any junk in the slot? Or on the cards pins?
Tried a different slot or Mobo?

[wertigon]

Check the motherboard specifications for PCIe lanes:

• If top slot is occupied and second is not, all 16 lanes are active on top slot.
• If second slot is occupied, x8 to top, x8 to second
• Third is always x4
• The first m.2 is always x4
• Second m.2 share two lanes with third m.2 for x4/x0 or x2/x2

Make sure your card is in the proper slot then report back. The good news is that you are losing like 1 FPS, tops, in a x8 4.0 card, so no real loss other than satisfying your OCD.