The Mail ive sent to [email protected]:
Dear Minisforum Support,
i come to you after your inshop Support wasnt really able to help me exept “Sorry, not support it”.
It is a really nice and awesome board and i am really enjoying using it - currently with an AMD RX 6800 instead of an RTX 4070 Ti.
Why?
Because the RX 6800 is running at Full Power with an Connection of PCI-Express 4.0 like its normal,
The RTX 4070 Ti is only running at PCI-Express 1.0 so it is nearly unusable as Gaming Machine. And i mean not just in IDLE - It also only uses PCI-Express 1.0 under LOAD.
Why nVidia Graphic Cards only get PCI-Express 1.0 from the Board? Are these Missing in the UEFI/Bios?
If your Browser is not able to show you the Pictures directly embedded into this Mail, i will add them also as Attachment to help you as much as i can with this Issue.
I hope you will fix that Problem in the Future with new UEFI Updates, because - as i already said - i think this Board is awesome and i love it and others will too for sure. 
Best regards from Germany,
Martin