So I took a look, to see if I can this working, and that driver confirms it's RDNA2
Quote from: Radeon Software 21.40 beta for Blender 3.0 TestingAMD Radeon™ 6000 series
AMD Radeon™ RX 6900 XT
AMD Radeon™ RX 6800 XT
AMD Radeon™ RX 6800
AMD Radeon™ RX 6700 XT
AMD Radeon™ RX 6600 XT
AMD Radeon™ RX 6600
are the only listed cards, 6000 series is RDNA2, last series are the RX 550, 560, 580, etc. I have the RX 580 and a a RX 480.