We are using AMD video cards so on first launch users get this warning message:
Ray-tracing on the GPU requires an approved NVIDIA graphics card and CUDA 5.0 or later. This may require installing the current display driver. For now, ray-tracing will use the CPU....
Each user can select Show Warning: Never Again but we would prefer that users never see this message.
In the prefs there is an option "showGPUwarning" or whatever it is called exactly. Just change the value accordingly.
Sorry, I'm looking for a Windows solution.