you should get a laptop with a GDDR5 Grafic card rather than DDR3 because 1 gig of GDDR5 grafics greatly outmatch 4 gig of DDR3 . that would be better if you want to play games on it!
If you want an average 30 fps, that laptop should do it, but probably not at the highest settings. VRAM-intensive settings, such as AA and very high quality textures will most likely need to be disabled.