Where it's a laptop most of the standard thoughts about the 4xxx line do not apply. Your card has the same audio support as a 3xxx desktop card, which means you can bitstream legacy DD and DTS but not TrueHD or DTSHD.
You can output stereo LCPM at highres but not multichannel. For Blurays this means you can playback the core legacy track in surround but not the HD track.
There is also not much you can do to upgrade the laptop to do more. Sorry to be the bearer of bad news.