Abstract: A multi-GPU rendering system according to a preferred embodiment of the present invention includes a CPU, a chipset, the first GPU (graphics processing unit), the first graphics memory for the first GPU, a second GPU, and the second graphics memory for the second GPU. The chipset is electrically connected to the CPU, the first GPU and the second GPU. Graphics content is divided into two parts for the two GPUs to process separately. The two parts of the graphics content may be the same or different in sizes. Two processed graphics results are combined in one of these two graphics memories to form complete image stream and then it is outputted to a display by the GPU.