Using CUDA on GTX 750 ti

i have GTX 750 ti , i am trying to use CUDA core or openCL for 3DsMAX iray or vrayRT render ,
but i can’t do this . i always see that there is no CUDA devise is found . Please Can anyone help me

For Iray there is an answer on the dedicated forum, its Maxwell GPU is not yet supported.
http://forum.nvidia-arc.com/showthread.php?12806-Maxwell-architecture-GTX-750-TI-and-Iray

Thanks for reply