Hi, I'm having troubles with win 10 as well.
I've tried a bunch of different combinations, but I'm not able to run 6x470 with modded BIOS, only 4 of them are working.

On default BIOS everything is ok, but crimson 16.12.2 can't recognize modded BIOS, so I had to downgrade drivers.
I'm trying a couple of drivers, but all with the same problem, only 4 with modded bios can run.

Any advice would be highly appreciated.