Thus I checked "octane Log" , it showed that "CUDA device 0: Failed to find a CUDA binary matching compute model 5.0"
My graphics card is NVIDIA GTX 750 Ti ( It did work well in octanerender standalone and plugin for sketchup.)
ps, [url]the version I used is Rhino5 SR8 and NVIDIA driver is GeForce 340.52[/url]
Does anyone occur the same circumstance?
Regards

