Hello stephenb.b.r,
I tried your method, but the Visual BIOS still does not show.
The graphics card is an ASUS R9 290X DC20C 4GD5, with the latest update. I am pretty sure it is UEFI compatible, at least, it has never had any problems with the Visual BIOS in the past.
None-the-less, if from BIOS 0450, I make the integrated graphics the primary display, restart, and flash the 0451 BIOS, I can then enter the Visual BIOS using the integrated display. But changing back to using the graphics card as the primary display, the Visual BIOS does not show. The F2, F7, and F10 prompts show, and the password box shows. It is possible to enter both the F2 and F7 menus. The monitor indicates that it is receiving a signal at 1280x960@60Hz, which is what the Visual BIOS otherwise uses, its just not visible. I can see no good reason why this new BIOS update would not continue to be compatible with the ASUS graphics card. There were never any display problems with the original motherboard BIOS, or the 0450 update.
I think it is understandable that until this new difficulty is fixed, I am unwilling to experiment concerning the other problems.
With BIOS 0451, the system will boot into Windows 8.1 Pro (which I have had to reinstall once, and restore from backup twice, as a result of previously setting the memory to the XMP 2400 profile).
Desktop utilities shows the memory voltage at 1.4V, even though the BIOS has the default setting of 1.5V (for 1333MHz).
Specs:
CPU i7-447K
Motherboard DZ87KLT-75K
Memory: G.SKILL DDR3-2400 PC3-19200 8192MBx4 CL 10-12-12-31 1.65V
PSU Corsair AX860i
GPU ASUS R9 290X DC20C 4GD5
Monitor Seiki SE39UY04 4K
CPU cooling Corsair H110
Drives Intel mSATA 120 GB, Seagate hybrid SSHD 2TB, ASUS optical
Other Corsair case & fans, Logitech keyboard, mouse, sound
So far this motherboard has dumped on the fans, the memory, and now the GPU. Dumping on "the little guys" tech is not what made Intel the multibillion dollar company it is today. Things have changed in the ten years since I last did business with Intel, and in the next ten years things can change again. Keeping it friendly, but one customer is not a happy camper .