1) You have NO expansion slots, So can not add a dedicated GPU.
Unfortunately you are stuck with the iGPU which is a HD2000.
2) HD2000 performance:http://www.notebookcheck.net/Intel-HD-Graphics-2000-100.37994.0.html
It is a Class 4, and many games are not playable. If you go to the link and scroll down you can get a feel for what games are playable. (didn't see yours listed)
Added: Recommended requirements (for GPU)
"•GeForce 8800 or equivalent video card (Dedicated GPU with 512MB+ Video Memory(VRAM))"
Bottom Line - If possible, return and pick one (do some research before buying) that will meet your needs.