1. A system for processing graphics data, comprising: a first graphics processing unit supporting a first initial memory interface to communicate with a first frame buffer, wherein the first graphics processing unit is configured to store a set of vertex data and a set of push buffer commands in the first frame buffer and to process the vertex data by executing one or more of the push buffer commands; a second graphics processing unit supporting a second initial memory interface to communicate with a second frame buffer, wherein the second graphics processing unit is also configured to store the set of vertex data and the set of push buffer commands in the second frame buffer and to process the vertex data by executing one or more of the push buffer commands; and a private bus that couples the first graphics processing unit to the second graphics processing unit and includes a portion of the first initial memory interface and a portion of the second initial memory interface, wherein the first frame buffer stores a first set of rendered tiles, and the second frame buffer stores a second set of rendered tiles, and wherein the first frame buffer further stores a copy of at least one tile of the second set of rendered tiles, and the second frame buffer further stores a copy of at least one tile of the first set of rendered tiles.