DXR on AMD Radeon hardware is not software accelerated like it is on pre-RTX GeForce hardware. AMD just accelerates it differently than nVidia does. Something like Bill's Radeon 6900XT has 80 RT cores. 1 RT core per CU. Where as my 6600XT has half that at 40. So on AMD hardware the RT acceleration is a dedicated part of the CU cores.
DXR is the standard for RayTracing under DX. It can be "software" accelerated through shaders. This is how nVidia does it on pre-RTX hardware. AMD never enabled that feature on older hardware and it's hardware accelerated on the newer RDNA2 hardware.
DXR is the standard for RayTracing under DX. It can be "software" accelerated through shaders. This is how nVidia does it on pre-RTX hardware. AMD never enabled that feature on older hardware and it's hardware accelerated on the newer RDNA2 hardware.