Maxon CINEBENCH is a 64-bit cross platform (Windows Vista/7/8 and Mac OS X 10.6+) benchmark for the GPU and the CPU based on CINEMA 4D.
The GPU (OpenGL) benchmark renders a scene with many effects and made up of nearly 1 million polygons. The CPU benchmark renders a photorealistic 3D scene (raytracing) and exploits all CPU cores.
GPU / OpenGL test
Here is my scores with a GeForce GTX 660 + i5 2320@3GHz under Win7 64-bit:
You can download CINEBENCH R15 from this page: MAXON CINEBENCH.