PCIe 16x issue

[BigB@dJ@y]

I'm running the following set up: -

Ryzen 7 7800x3d
Asus Rog Strix B650-A gaming
32Gb DDR 5 6000MHz ram
Sapphire Nitro+ Radeon 7800xt

I have 2 x NVME drives (Gen 4) in slot 1 & 2 on the mobo.

When firing up GPU-Z I noticed the Bus interface for the 7800xt states: - PCIe x16 4.0@x8 4.0
but when selecting the AMD Radeon Graphics (APU) its showing as : - PCIe x16 4.0@x16 4.0

This doesnt seem right! I had read that using an NVME drive in either slot 1 or 2 would not impact the GPU lanes (only slot 3).

Have I missed a setting in the bios? Any thoughts?

Do I need to disable the integrated AMD apu?

 

[BigB@dJ@y]

Ive removed the NVME and reseated the GPU still the same thing
I tried pressing the question mark to the side of the Bus setting in GPU-Z and ran the render test but no change.....hmmm

 

[BigB@dJ@y]

I changed them from auto to gen 4 in the bios and the same thing. I'm hoping its gpu-z problem...any other software I could use to check it?

 

[BigB@dJ@y]

update:

• I reset the CPU
• Loaded Optimised settings in BIOS
• Put my old GPU in to test (6800xt)
• GPUZ shows x16!!!
• swapped GPU for my new 7800xt and back showing x8

could this be a defective GPU?

My brother is coming round today with his PC to sort some fan issues out so I will test the 7800xt in his rig. That should confirm it (or not)

 

[BigB@dJ@y]

Thanks for all the suggestions, It looks like its the card is defective as I have now tested it in my brothers PC and it does the same.
He is running a ASUS Tuf 6800xt on a Gigabyte Aorus B550 Elite V2 board. He has various NVME drives in both of his slots.
I ran GPUz on his system before I started and its [email protected] as it should, I then swapped out his GPU for the 7800xt and its showing [email protected].
I always press the render button to put the gpu under load and no change after a few mins (at 70% +).

I then put my old 6800xt in his pc and it was straight back up to x16.

No visible damage on the card whatsoever (just bought off these forums and its immaculate). I have spoken with the seller and they're going to RMA it.
Probably just an issue that's gone undetected (as it doesn't impact performance too much but it should really be working at full capacity).

 

[BigB@dJ@y]

Did you try flipping the bios switch on the card?

Yes, tried it set to Primary, then secondary as well as Software mode but still x8