Z790-E refuses to use pcie 4.0x16 and only ises x8

[Captaindooguls]

 I have even used gpu-z and got the same under load or not. 

Things I tried:

-Reseating gpu

-went into bios and tweak pch configuration

-moved m2_1 to m2_2

[GTGhigo]

If no have already bios 0816 , try put m2 in a slot 3-4-5 and bios update so you get alsoget board reset https://dlcdnets.asus.com/pub/ASUS/mb/BIOS/ROG-STRIX-Z790-E-GAMING-WIFI-ASUS-0816.zip?model=ROG%20ST...

[Captaindooguls]

Did this just now and nothing. Still shows as x8 in bios and gpu-z.

[Hopper64]

I would not RMA until you troubleshoot a little more. Have you tried taking out the m.2 altogether or moving it to another slot like Ghigo recommended?

[Hopper64]

And does the video card do x8 in another slot? Can you try the video card in another PC?

[GTGhigo]

yes must use the top slot pcie always for gpu on all z790 boards, also usign bottom one if no have an insane huge case , really hard it can fit or get good cooling