GPU running on a x16 pcie port at x4

[hiro00345]

Motherboard: AsRock Z97 extreme4
Cpu: Xeon E3-1231 v3
Gpu: Msi GTX970
Ram: 2x8Gb
OS: Windows 10

GPU-Z and speccy tell me that my GPU is running on a x16 pcie-port @x4 3.0. Why is it only x4?
This doesn´t change when I use the build in GPU-Z performance test. The test only changes the speed from 1.0 to 3.0 but the lanes stay at x4. I tried 3dmark fire strike benchmark with the same result.

I´m using the upper pcie port (PCIE2) and there are no other pci-cards in the motherboard now.
I tried the PCIE5 port which is meant for a second GPU at x8. This time GPU-Z tells me I´m using a x16 port at x8 3.0 which should be correct.

I also tried a different GPU (GTX1080) but nothing changed.
The GPU is plugged directly into the PCIE2 and port and GPU pins are cleaned.
I´m using the newest drivers for the GPU and the motherboard. I also reinstalled windows 10.

Can anybody help me?

 

[scout_03]

it could be board bad wiring did you contact asrock about this .

 

[caustin582]

You could try checking the PCIE2 link speed in the UEFI. See page 80 of the manual: http://asrock.pc.cdn.bitgravity.com/Manual/Z97%20Extreme4.pdf

Not sure why this setting would have been misconfigured in the first place, but it's the only thing I can think of.

 

[scout_03]

check what you see under pci express and do the same for pcie2 to see if you could put 16 x other then auto then apply change and recheck for pci speed .

 

[hiro00345]

Hi. Thx for your reply.

Pci express is the only option for "primary graphics adapter". For "pcie2 link speed" I can only choose between Auto/Gen1/Gen2/Gen3.

I have made a similar post in the asrock tech support forum but didn`t get an reply yet.

 

[scout_03]

then try all gen to see if one give the 16 x .

 

[hiro00345]

none of the settings changed how many lanes the GPU uses.

 

[scout_03]

then i would ask for a rma .