LuxMark
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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.
The Club3D card remains a few per cent shy of the performance exhibited by the two HD 7970s. What's abundantly clear is just how much faster AMD's cards are than NVIDIA equivalents, but we have yet to see the GTX TITAN strut its stuff. Performance, however, scales almost perfectly from one GPU to two.