That was my test with a RX6600. This driver is only avalible for RDNA2 cards for Windows 11 Insider 22H2, but i exported the driver and i can confirm it can be "manually installed" on older GPUs, RDNA1, Vega APUs, maybe Polaris, i havent tested Polaris but it is listed in the driver as well. Some people already tested on Windows 10 and Vega APUs and it has considerable gains as well.
here it is the driver package: https://drive.google.com/file/d/19wcSRoiwy3H8xJXOoBPAwOLNDzLX6jIB/view?usp=sharing
It has no installer so it can be only manually installed with the Device Manager.