I've recently assembled the system in my profile description and I'm having a few issues while in the BIOS.
The navigation is sluggish (using the keyboard feels better than the mouse), wiggling the mouse lags the cursor a little behind, clicking the tabs at the top in advanced mode triggers a very slow transition animation to the next page (this I've solved by disabling the Setup Animator in "Tools") and
the worst symptom is that I'm experiencing occasional video corruption on small areas of the screen (it looks like the portion of the screen doesn't get refreshed properly and moving the mouse over the area "repairs" the issue. See this video here
The whole thing feels a little worse than using Windows without an accelerated video driver.
I'm also a bit confused about the BIOS saying "Please select a valid GPU" at the GOP/VBIOS Status (see attachments), because I've upgraded the video card's BIOS to the latest version and I have one that supports UEFI.
Other than these, I've got no issues with the system: I've got the latest BIOS version (1702), and everything seems stable: no overheating, no memtest/prime95 errors, no video issues while playing games or movies, etc.
What could be the cause of the video artifacts in the BIOS?
PS: I'm using a display over a DVI link.