OS:
Ubuntu 14.04
Steam OS 2.0 (NVIDIA & Intel Only)
Graphics Card:
Nvidia 600 series+ with Driver Version 352.55
AMD R7 with Mesa 11.2 driver*
Intel Iris Pro with Mesa 11.2 driver*
*IMPORTANT: AMD GPUS may require Ubuntu 15.10 or later. Mesa 11.2 driver still in active development.