Hi, I am using Windows 2012r2. I have an Nvidia K2 card on board which has dual GPU. How do I launch mpiexec to use 2 GPU? I have tried running mpiexec -n 4 pvserver -display :0.0 --use-offscreen-rendering : -n 4 pvserver -display :0.1 --use-offscreen-rendering , but it only uses 1 GPU. Thanking you in advance. Rgds, izraz