A DGS (discrete graphics system) unit is disclosed. The DGS unit includes a system chassis configured to house a GPU, the GPU for executing 3-D graphics instructions, and a GPU mounting unit coupled to the system chassis and configured to receive the GPU. A serial bus connector is coupled to the chassis and is coupled to the GPU mounting unit, wherein the serial bus connector is configured removably connect the GPU to a computer system to enable the GPU to access the computer system via the serial bus connector and execute the 3-D graphics instructions for the computer system. A power supply coupled to the system chassis for supplying power to the GPU independent of the computer system.