GeForce NOW requires a GPU that supports DirectX 11 or higher, including these GPUS:
NVIDIA GeForce 600 series or newer (except certain GeForce 800 series. Please see below)
AMD Radeon HD 3000 series or newer
Intel HD Graphics 2000 series or newer
800 series GPU's not supported include: GeForce GTX 880m, 870m, 860m, 850m, 840m, 830m, 820m, and 800m