The GPGPU product lineup will be known as Tesla. Tesla is a top to bottom product lineup consisting of internal PCIe cards and external high-performance computing, or HPC, systems – Tesla C870, S870 and D870.
It is for prerendered things like movies I believe. It would do part of the ray tracing processing I guess. It would send its results back over the PCI-Express bus, similar to what happens when you take a screenshot in a game.