Sorry, newbie here.
Finally I managed to get my ASUS GTX 1070 8GB dual.
The seller confirmed that they are not selling hynix memory,
Although I didn't get a samsung memory, but still get a micron memory.

https://preview.ibb.co/eiMiBG/gtx_1070.gif

overall the base hashrate was 26.5mh/s (CPU is 30watt-40watt)
The total power used is around 150watt (include CPU watt) at first place.
I manage to overclock it and make it +500 memory clock, with lowering down the total power limit to 70%.
So far it looks pretty stable. The current hashrate is 30.2mh/s with 160 watt (include CPU watt)

https://preview.ibb.co/c2es5b/Hashrate.png

https://preview.ibb.co/c8yVrG/overclock.png

Do you guys think that I can do any better to reduce the power or increase the hashrate?