As others mentioned already, it's only going to play relatively light games. Some of the most demanding ones might be able to run, but at minimum settings and at the lowest resolution.
For how good the HD 4400 is for an integrated card, it's simply not fit for heavyweight gaming.
Also, to add up on what boosted1g said, it's not actually that good of a CPU...
I mean, sure, it's an i7, but it's an ULV chip, and its clock speed is 3.1Ghz only when under TurboBoost-compliant conditions. As soon as it'll start heating up, it'll throttle down to 2Ghz or less, with massive framerate hits on some games.
Source engine games are OK, pre 2004-2005 games should be fine as well; on some games, you could stretch up to 2007-2008 by gradually lowering details and resolutions the more "recent" you get, but anything else will most probably stutter to the point it's unplayable. Retrogaming is also a viable option, should you like it.