Thanks for your answer. I have done what you say with TASK MANAGER, using the Performance Tab. I see the CPU working at 100%, the GPU0 working at 1% or 2%, once it went up to 6%. The NVIDIA GPU1 was always ''working'' at 0% but once it jumped to 6% for a second or so, out of several minutes I was watching. I guess it is as you say that the GPU is not being used or it is used minimally. Any suggestion?