Cycles not supporting Cuda/ OpenCL

i used a 9500gt on a desktop pc with cycles and tried the official 2.61 beta and only CPU device rendering is supported.
when i switch to CUDA in GPU and set viewport shading to Rendered it says “CUDA Binary Kernel for this graphic card not found”.
i’ve installed the latest driver and the build from graphicall always worked fine with cuda. whats wrong? does anything else need to be installed?
Thnaks for the help.