Anything that has Kepler (GTX 650 or higher), Maxwell (GTX 750/Ti and 950 or higher), or Pascal (GTX 1050 or higher) architecture should support NVENC. The GT640 is probably Fermi-based which is older and didn't have NVENC support. I did hear that one of them is a GT-based Kepler below the 650, but I would get something better instead.
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