I've updated my dGPU from RX6600 to RX6750GRE 12GB by ASUS, thus I've made a new branch for those who use natively unsupported rDNA2 dGPU and B450M chipset.

My EFI for B450M chipset & AMD dGPU is shared below.

Fully working!

Metal3 acceleration works fine too

My Hardware

Components	Recommended
Motherboard	MSI B450M-A PRO MAX
CPU	Hexacore AMD Ryzen 5 5500
WiFi	RTL8811CU USB WiFi Card
Ethernet	RTL8111
Graphics Card	AMD Radeon RX6750GRE 12GB
RAM	1x 32GB DDR4 3200 MHz
RAM	1x 8GB DDR4 3200 MHz
macOS	12.1-14.5

Most stuff works fine here. However, WiFi card related stuff like continuity, AirDrop, FindMy won't work since I already have a M1 Pro MacBook Pro as primary machine so no need to get an expensive Broadcom Card.

Grab my EFI files here:

For Navi21/22/23 cards that ain't natively supported:

https://github.com/EraserCN/B450M-Hackintosh/releases/tag/Navi21%2F22%2F23-0613

For natively supported cards:

https://github.com/EraserCN/B450M-Hackintosh/releases/tag/master-0613

I'll continue to update the files through my repo

Please don't hesitate to give my repo a star if you find it helpful!

Let me know if anything went wrong through issues.