NVIDIA cards and compute mode vs WDDM mode

NVIDIA high-end GPUs (Tesla, Quadro, etc) can be configured to run in either Tesla Compute Cluster (TCC) mode or Windows Display Driver Model (WDDM) mode. The difference between the two is that in TCC mode, the cards dedicate themselves completely to compute and are not meant to have a local display. In WDDM mode, they act as both a compute card as well as a GPU for displaying local graphics.

You can force the cards into either mode by navigating to the default directory, c:\program files\NVIDIA corporation\nvsmi, and running nvidia-smi -g {card number} -dm {0 or 1}.   Mode 0 is WDDM mode and mode 1 is TCC mode.

References:

http://http.developer.nvidia.com/ParallelNsight/2.1/Documentation/UserGuide/HTML/Content/Tesla_Compute_Cluster.htm

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