Try setting the PCI-E slots to GEN 2 or GEN 1 in the Bios. Also make sure the PCI-E 4-pin power connectors are plugged in to the motherboard and see if Windows is installed in UEFI mode.

How to test whether Windows 10 was installed with UEFI?

https://superuser.com/questions/946868/how-to-test-whether-windows-10-was-installed-with-uefi