Dual rank Samsung B die was 80/96Ω or 43.6Ω on C6H.
Suggested ProcODT values from Elmor/The Stilt for C6H:-
Samsung B (SR) 2x8GB 53.3Ω / 60.0Ω
Samsung B (DR) 2x16GB 80Ω / 96Ω
Samsung B (DR) 4x16GB 43.6Ω
Hynix A (DR) 2x8GB 53.3Ω
Hynix A (DR) 4x8GB 40Ω
You may also need to tweak RttNom,RttWr and RttPark, some users of C6H had good sucess with DR by changing those values, also CAD bus config.