What pixel shader version is a Nvidia 420m laptop video card compatible with?

The rest of the specs on my comp appear to match the system reqs for The Witcher 2, (The game i'm planning to play) But it recommends Pixel shader 3.0. which i have no idea if i have. Also any input on whether or not i would be able to play the game at all with that video card, assuming my other specs met reqs, would be great.|||Yours supports 4.1, you're fine, now the issue is if you can run the game with respectable framerates with that integrated gpu.