Benchmarks - GPGPU
LuxMark is an open-source, cross-platform GPU computing benchmark. Based on LuxRender, a freeware rendering program, this GPGPU benchmark tests each graphics card's ability to construct a complex scene using OpenCL.
LuxMark's render loves the OpenCL compute power of Radeons. What's perhaps more telling is the fact that the GTX 550 Ti, based on the Fermi architecture, performs better than the GTX 650 Ti.