Fine on an asus sabertooth z97 go disable CSM? Windows 7 will load and no keyboard or mouse and no disk. Actually Windows 7 does have efi usb2 but you can't install it.
Put CSM on and windows 8.1 slows boot time and does 1981 bios emulation for Windows 7.
It is legacy now and crusty. Not obsolete yet but with work arounds like XP had which considered SATA exotic with special drivers shows it's age. SOC silcon on a chip where it is designed to interface with firmware and not 1981 based IBM limitations are going to be more of an issue.
FYI there is hardware sold right now at Bestbuy with NO Windows 7 support. No drivers. :-(
Yes there are USB 3 drivers on cd but Windows 7 is not fully UEFI 2.3.1 compatible. WINDOWS 10 is!
6 years like the grandparent said is a long time in technology. WINDOWS XP was the exception. Never the norm and is about it except for legacy equipment