Performance is about the same, but the AMD blockchain drivers have an 8 card limit. The Crimson Relive 17.11.x and Adrenalin 17.12.x drivers let you run at least 13 cards and are compatible with the Windows 10 v1709 fall creators update.
How do you get the new drivers to have equal performance to the blockchain one? Even with compute the performance loss is there. 28MH/s to 26.5MH/s for example.
You already checked that ? I also use blockchain drivers. This version 17.12 have also dag fix ?