Just as an FYI - I have 5 470rx's in the same rig (xfx, sapphire and msi), tried the new beta blockchain drivers, it was a non starter for me. My drivers (patched), atipixel patcher etc, 6 card patch, but MSI afterburner version I use didn't allow me to set anything and also there seemed something wrong, like the driver hadn't installed properly, even though, everything had and there was no driver issues in device manager etc. So went back to 16.11.5-Nov25 which works great for me. All running on WIN 7 64bit.
Just an FYI