Re: I can't activate opencl.

If you have more than one graphics card:

• NVIDIA and Intel:

1. Right-click the desktop and choose NVIDIA Control Panel.
2. In the sidebar, select 3D Settings > Manage 3D settings. Click the Program Settings tab.
3. Add sniffer.exe and Photoshop.exe (from C:\Program Files\Adobe\Adobe Photoshop CC 2015).
4. Save the changes.