A reliable and popular benchmark, 3DMark Vantage can provide a good insight into overall gaming performance of a system.
Valve Source Particle Simulation
Valve released this particle simulation test a while back for benchmarking platforms and CPUs.
Valve Source Map Compilation
More of a developer test than gamer test, this benchmark is indicative of how long it takes a system to compile a map.
More positive results for the new SNB architecture as it takes a performance lead in 3DMark Vantage and the aging Valve Source tests over everything but the 980X.