HD 7870 problem :/

Hi to all!
I installed Hackintosh on the H110M-K board with the latest bios. I5-6400 processor, AMD Radeon HD 7870 2GB graphics. The card is Sapphire HD 7870 - the bios of the card has no UEFI. In the motherboard bios, I had to leave the CSM turned on - otherwise it would not start at all.
The Big Sur system on opencore 0.7.6 is getting up nicely - as if everything is working on the graphics card detected by the system, but the hardware acceleration does not work: /
What can I do to make it...

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Author: Torin