for 970 nvidia
still better to use win7 , 347.52 driver with ethminer 1,1,4 -G option ?
For Nvidia use -U, not -G. When using win7, you can also use latest drivers.
347.52 (or 350.12, better) is only for gtx960,970,980 (950 too with some additonal tweaks) on Win10. This also requires a CUDA 6.5 build, which you'll need to do on your own.