Just mounted the MB on title and updated everything about its firmware.
I am not able to reach 16x with a GTX970 video card. Stuck at native 8x in UEFI informations.
Tried every PCIe slot but no way.
I hope it is the video card, even if I read that this is a quite common issue.
I mount a 28 lines PCIe processor (I7 7820x) and I haven't mounted any other PCIe device.
Last try is to use BIOS2 (0601) and see what happens.
For the moment I am not able to find another video card.
Any other idea or test to do?
Thanks.