To mine ETH you need mostly memory speed. So you have to copy lower memory straps to the higher ones, increase memory speed and lower core speed a bit to reduce power consumption. all this can be made with SBPolaris.
About the 1070, you can mine ETH with it. Check memory brand to see how much you can OC.
I think most people use the 7950 to mine ZEC.
You don't need all that RAM.
Also, be aware of your PSU, because there's a lot of power hungry GPUs there.