I really couldn’t say from personal experience how well each individual card and driver handles non-power-of-two textures, sorry.
From the OpenGL wiki:
Though keep in mind that it’s not just a question of whether NPOT textures are supported, it’s also a question of how well they perform under it. If they implement it by just upscaling a texture at the driver side, then there is of course little benefit - especially if they do the upscaling less efficiently than Panda does (eg. every time it is bound).