According to our source there are problems with GeForce 7950GX2 in Quad SLI configurations. A GeForce 7950GX2 card with its two graphics circuits are suppose to work excellent, but four graphics circuits are causing a mess. We haven't received any details about the problems and judging from the drivers the problems are related to the drivers as NVIDIA has simply deactivated the Multi-GPU mode with the drivers.

NordicHardware