PD, in any case if it has the shortened version (the fury with 56 cu sapphire) I can upload the vbios with the modified timing and you will be able to verify that amdmemtweak does not reflect the changes although in mining it behaves differently
I have version 64cu and I can applay timing with amdmemtweak it reflect to some algorithm as Argon2d-nim hash from 360 KH/s to 400 KH/s. But now not time to mine NIM
I suppose that the versions of 56 have a bottleneck due to the missing cu.