For what it's worth, I ran 2004's Half Life 2 on a Sandy Bridge (12-core) just to see if it could do it. It actually ran well, to my shock.
I tried Crisis on Ivy Bridge (16-core) and it was an utter joke. It couldn't render it quite right, but was just a slideshow. 15fps would have been astonishing next to what 16-core Intel video can accomplish.
And haswell ups it to 20 cores...
So yeah, I think older games will run, but newer stuff, no way. Maaaaybe what, 2004 and earlier will probably run? Anything with that level of graphical complexity, which of course includes a lot of new games too, but I'd assume Battlefield 4 would barely run.
Dang, wouldn't it be awesome if Surface 2 COULD run stuff like that well though?
Darn, I was going to run Battlefield 3 for you on my Ivy Bridge, see how it did (I suspect horribly) but it turns out Battlefield 3 on PC requires a browser plug-in. Granted it's a real developer, and it's EA, but I'm not super comfortable with that. May just play it on console, if I ever do (got it cheap/free-ish from that Humble Bundle charity thing).
Believe it or not, my Geforce 680m runs Crysis even better than Ivy Bridge's magnificent video! 😉