From http://developer.nvidia.com/object/optix-beta.html

"NVIDIA® OptiX™ ray tracing engine Beta

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Beta 1 for OptiX 2 Now Available

Beta for version 2 of the NVIDIA OptiX ray tracing engine is now publicly available to all software developers. Version 2 will eventually be providing newly optimized support for NVIDIA's upcoming "Fermi" GPU architecture. As a precursor to this support, the Beta broadens support to include currently available NVIDIA GeForce GPUs.

Beta System Requirements:

Graphics Hardware:

• OptiX supports most CUDA-capable GPUs, but is only fully functional and supported on NVIDIA's GT200 GPU architecture. Earlier NVIDIA GPU architectures will operate to the extent their CUDA cores and memory permit, but cannot be used in multiple GPU configurations and will deliver substantially less performance per CUDA core when compared to GT200. 
  
• If you find an issue with OptiX, please verify it is reproducible on GT200 hardware, as only fixes on current GPUs can be verified, and issues limited to older hardware will not be addressed. Products based on NVIDIA's GT200 architecture are:
  • Quadro FX 5800, Quadro FX 4800, Quadro FX 3800, Quadro CX
  • Quadro Plex 2200 D2, Quadro Plex 2200 S4
  • Tesla S1070, Tesla M1060, Tesla C1060, Tesla RS
  • GeForce GTX 260, GTX 260 Cre 216, GTX 275, GTX 280, GTX 285, GTX 295"