What version of darktable you are using? The current master has a significant number of improvements with OpenCL.
Also, do you have Microsoft OpenCL compatibility pack installed (it could be installed by default)? I had to uninstall mine.
What version of darktable you are using? The current master has a significant number of improvements with OpenCL.
Also, do you have Microsoft OpenCL compatibility pack installed (it could be installed by default)? I had to uninstall mine.