You might be able to play on low since that chip set just came out las year and your onboard is a Q8800s or Q9550s. The second one should be able to do low settings the Q8800 I don't know for sure about that one.
All you can do is try it and if not then then invest in a GPU that would be able to handle your rig. like a HD 6770 or a HD 6850. Good luck to you.