I have fail again trying to put BigSur On, My setup is, Ga-Z270X-Gaming SOC, Intel i5 7400, DDR4 Memory. You can see from the IMG where the monitor stops. I may have set the Bios wrong, I set the Bios as -
Load Defaults

Mem setting - Profile 1
Fast Boot - Disable
Window Profile - 8/10
Lan PXE Boot Option - Disable
Boot and Other - UEFI
Instant Display Output - PCI 1
XHCI - Enable
Legacy USB Support - Enable
Network Stack - Disable
Sata Mode - AHCI
Vtd - Disable
I do hope...

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Author: dirtwegy