There is a known precision bug in the current HIP compiler version (RDNA2 family/Windows) that has already been fixed and will be available in
a future HIP SDK release. Enabling more precise math prevents the artifacts.
This may cause a 5-10% performance drop in some scenes.
Fix#136138: Microfacet BSDF
Fix#136449: Hair BSDF
Pull Request: https://projects.blender.org/blender/blender/pulls/136341
ae710101f5