With the 12x biostar nearly here, I don't think this is the right change to make. If the biostar can actually run 12x GPUs then I will for sure; not make this alteration. If it can only support 9x or less GPUs then I will consider making the change.
Speaking of 12gpu motherboards, I've got an ASRock 13 GPU board arriving next week. Any thoughts on how to configure nvOC with an ASRock to get as many as possible of the GPUs running NVidia? (my current board is an ASRock z270 that loads 6 GPUs without too much trouble, but the new board is H110, not Z270) I've got 9 GPUs on hand to try - 8 1070s and a 980 ti.
In theory v0017+ can support 14 GPUs (13 + 1 via m2 adapter with that ASRock mobo).
But the chipset might not currently be supported and there are likely other system changes needed. I need one of those mobos to test. Where did you order one from?