The possible reasons why you can’t active GPU acceleration when you have NVIDIA CUDA on your computer are:
1 Your NVIDIA video card does not support GPU acceleration. For the details of the video card supported and their
versions, you can visit the link below: http://www.leawo.com/knowledge/nvidia-cuda-technology.html
2 The video card driver is incompatible with the video card.
1) For NVENC with Kepler or Maxwell, download and update the latest driver. You can download and update driver
from http://www.geforce.com/drivers .
2) For NVCUVENC with Quadro or Tesla, driver version 341.05 is the last driver to support NVCUVENC.
32-bit Download URL: http://www.nvidia.com/download/driverResults.aspx/79104/en-us
64-bit Download URL: http://www.nvidia.com/download/driverResults.aspx/79105/en-us
Or you could try to download version 337.88
32-bit Download URL: http://www.nvidia.com/download/driverResults.aspx/75996/en-us
64-bit Download URL: http://www.geforce.com/drivers/results/75991
Note: If you have already installed NVIDIA driver, you must uninstall it before installing the new version.
3 Your video card is damaged or too old. Please change to a newer NVIDIA video card.
PS: You can visit the link below to know your video card information:
If it still does not work, please click top right ? to go Help Center, send us the Bug Report.