So I finally managed to find some good and stable settings for my 1070 GPU. Here are the details:

[Card]:1x PNY GeForce GTX 1070 XLR8 OC GAMING 8GB
[TDP]: 70%
[Core]: 0
[Memory]: +615
[Fan speed]: 60%
[Temp.]: 48-52C
[Whole system]: don't know, I guess around 140-150.
[Mining performance]: 31.2mh/s on Ethereum
[Miner]: Claymore 9.7 (Windows 10 65 bit)