Why nsight is not supported Geforce GTX 970M?

i want to debug my shader with NVIDIA Geforce GTX 970M.

Nsight Visual Studio Edition Supported GPUs (Full List):

i have found that NVIDIA Geforce GTX 970M is in the list,but when i debugging ,the shader list says:

Shader Debugging is not supported for this GPU.

did anybody help me? thanks !