http://www.anandtech.com/show/7072/intel-hd-5000-vs-hd-4000-vs-hd-4400
http://semiaccurate.com/2013/04/15/putting-intels-new-hd-4000-drivers-to-the-test/
hope this helps, basically yes you can play games on it with everything on low above 30, as long as it isnt a very high fidelity title like crysis 3, dont really recomend bf3 either