I do read posts and I do not spam. I was simply stating that I have the same option in my UEFI bios and enabling it doesn't cause any issues. So perhaps it's a config error on your behalf.
I know my 960 is not a pro card but the option is in my UEFI bios and I can enable it (I don't) and boot just fine. So the point isn't moot, it's a bios option that I can enable without any issues and you can't.
This is a help forum and I provided help by showing you my system and stating that I also have the option as with another of your systems but one of yours has issues with the option so perhaps it's a config error.
Is your bios up to date?
Maybe reset bios settings to recommended, reboot, change basic settings to boot macOS, boot into macOS, test, reboot, enable setting, reboot, test.
Sent from my SM-G930F using Tapatalk
Yep - latest BIOS - have tried defaults etc but as I was saying above it happens on certain chipsets when the controller kext initializes for the GPU - for instance if I load the system without QE/CI enabled, it works (Above 4G). With QE/CI enabled - it fails when initializing the video card (verbose)... can't seem to figure it. Have tried with UEFI / without. With Whateverkext / without. ATI inject on/off. DSDT/none/ Clover/ non. All patches / different arrangements etc. Kinda exhausting what to think of.
Far as your motherboard and enabling Above 4G decoding is concerned goes. I'll explain. So - when you enable it in the UEFI what happens is - it then allows the support of the feature; but for it to actually work a couple other factors have to be met. 1) You'll need to manually raise the PCI latency timer to something above "32" in your UEFI unless yours does so automatically 2) You have PCI/PCI-E devices that actually support "Above 4G decoding" - meaning if you don't - it won't actually be enforced on any devices once the OS engages. That's all I meant by "moot point".