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Dell Optiplex 3046 SFF: 4K output OpenCore (Big Sur)

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Dell Optiplex 3046 MT, Core i5-6500, 16Gb DDR4-2400, Intel HD530, 2560x1440, Big Sur 11.1, DELL U2718Q 4K


I installed Big Sur, the config was taken from some forum, everything works fine except for displaying an image at a maximum resolution of 2560 × 1440. The computer is connected to the monitor via DisplayPort.
DELL U2718Q monitor supporting 4K output. Windows on the same computer outputs 3840x2160 60Hz.
Can someone help to get to output 4K resolution in Big Sur?

EFI_OC.zip ioreg.zip

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