Graphic acceleration MSI RX560 on Mojave

My first hackintosh. Was Installed on unsupported hardware. All is working except vram & sleep. But sleep doesn't matter.

motherboard: gigabyte GA-P67X-UD3-B3

cpu: i5 2500k (Sandy brige)

RAM 4x4gb 1333 Mhz

video: MSI Aero rx560 4gb

monitor res: 1920x1200, connected via DVI

Issue:

Mojave detected only 8 mb vram (of 4096).

Despite videocard connected in PCIe x16, mojave detect it like "x8"

Resolution is ok if i set it in Clover manually.

I was trying add lilu & whatevergreen kexts, set fake amd id & set vendor id, use Inject ATI & radeondelnit in many combinations, but all this was unfortunetly useless.

The same situation was with my radeon5450, but I thought it was because 5450 not supported at all on hardware level. So I bought rx560.

Please, help with it, maybe someone has the same configuration...