GPU- whether ASUS card support?

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NVIDIA produces the graphics chip on the board (the GT520), and Asus buys the chips from NVIDIA.

In other words: As long as it has an NVIDIA chip it does not matter who made the board (ASUS, XFX, Gigabyte, Club3D, etc.).

Download CUDA 4.2 (NOT the newest version) and then follow this guide: http://stackoverflow.com/questions/13228762/opencv-2-4-3rc-and-cuda-4-2-opencv-error-no-gpu-support