ROG STRIX Z690-E GAMING WIFI PCI x8 x16

[{SKiDRoW*]

Hi!

I have an issue with the bandwidth of the PCI lane on my motherboard, it is a z690 as it says in the title, and the GPU is a RTX 3060Ti
Well the issue is that GPU-Z says the bandwidth is x8 insted of x16, no matter what I do (start render test) here is some snapshoots





GPU is in the first PCI x16 lane, and I have a soundcard (soundblaster zx) in the second PCI x16 slot, because it doesn't fit in the x1 PCI.

Could it be that the soundcard interferes with the bus?
Is there something in the BIOS to change that i'm missing?

Thanks!