I have 6 Zotac Mini GTX 1070 (Asrock h81 BTC r2.0 / Thermaltake RBG 850W Gold / 8GB) .
My best efficiency for ZCash is:
- TDP: 65%
- Core: +50 (1580-1607)
- Mem: +200 (4000MHz)
- Fan: 80%
- Miner: DSTM 0.6
- Driver: 391.01
- ambient temperature: 17°C (62,6°F)
- card temperature: 43°C-53°C (109,4°F-127,4°F)
- Pool: flypool
- sol/s: avg. 2500
- Wall: 680W
Those zotac mini cores can all hit +200-225, you should be around 2800-2900 hashrate. Zcash is core hungry.