I was able to get 12 Nvidia cards working last night with Claymore for Ethereum.
10 - GTX 1070 (26 MH/s each)
2 - GTX 1060 (19 MH/s each)
Before I was having trouble with EWBF Zcash miner.
What BIOS mods did you need to make to get it to work? Not even getting mine to boot yet with that many.