I rarely see viewport animations as smooth as a playblast, whether on my 2012 15" retina, or on my Mac Pro work station. Does it happen in every scene? If yes, then it could be a driver issue and you might have to wait for an update. Otherwise, it could just be the complexity of the scene is too much for smooth playback without dedicated graphics memory.
another thing you could do to troubleshoot would be to download the trial of a different version of maya. it won't be listed on the main autodesk site, but if you search for the latest service pack (for example maya 2013, service pack 2) you can install that and it includes the full binary for maya (just register as a trial). That way you can see if it's just that version of maya on that machine.