@HappySweeney’s close on 2DPC 2R 6200 and MSI supports 2DPC 1R at 6400. Not sure if @ubergarm’s looked at quads, I’ve currently only got a dual DIMM Granite Ridge config.
FWIW the 7950X B-die build I did last year had no problem with 4x48 at 4800. Didn’t like 5200 but I haven’t had a chance to check back with AGESA 1.2.0.2.