Here is how you make XMRig work with GTX970
I had to edit XMRig.ps1 to change the parameters to 13x39

"cryptonight" = " --cuda-devices $SelGPUCC --cuda-launch=13x39" #Cryptonight
"cryptonight-lite" = " --cuda-devices $SelGPUCC --cuda-launch=13x39" #Cryptonight-lite