BIOS version, please...? If you installed the OS while in CSM mode, you will need to reinstall the OS after you disable CSM in BIOS. CSM =
here. While in CSM you tend to loose out the potential of your platform since it's forced to run in "legacy" mode as opposed to utilizing concurrent tech that your platform has.
I don't know a lot as I said before.
That's what I'm worried about.
At this point, I'd advise sourcing a 16GB pen drive, then use Windows Media Creation Tools to recreate your bootable USB installer for your platform. You should also download all necessary drivers pertaining to your platform and have them on the pen drive after the OS installer fabrication is completed.
Can you parse images of what you see in Boot? Set Storage controller to AHCI, Enable Fast Boot, Disable Secure Boot, disable CSM and then go ahead with the OS reinstall. Out of further curiosity, how many physical partitions do you have on the 970 Evo Plus SSD?