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Based on OpenCV's GPU accelerated computer vision page it seems that generally all OpenCV computations are done with CPU except CUDA calculations. So for everyday OpenCV use the video card does not matter.
However "The OpenCV GPU module includes utility functions, low-level vision primitives, and high-level algorithms. The utility functions and low-level primitives provide a powerful infrastructure for developing fast vision algorithms taking advantage of GPU whereas the high-level functionality includes some state-of-the-art algorithms (such as stereo correspondence, face and people detectors, and others) ready to be used by the application developers."
