Today I tried existing miners, I don't like their stability and speed.
Ok, I will release first version of my ZCash miner very soon. AMD only.
Good news, and thanks Claymore ... So far on Win7 I can only get the Nicehash miner to work out of all the current offerings. The rig has 4 Nitro RX470 cards, but using more than 3 just crashes the rig.