The i7 U models are not as good as the QM ones, but the 950m video card will make up for that quite a bit.
If you can return it, I'd do that and get a real gaming laptop if you want to play games like Fallout 4, 860m/960m and up is where you want to be for demanding games in lower to mid settings. Take a look at www.xoticpc.com they have a good selection and easy to sort though the systems.
There is this Dell that is pretty good, although I think the price went up a bit recently from their black friday prices
http://www.amazon.com/Dell-Inspiron-i7559-763BLK-Full-HD-GeForce/dp/B015PYYDMQ