http://www.newegg.com/Product/ComboBundleDetails.aspx?ItemList=Combo.634227
What makes you think that's a gaming PC lol.Old Athlon technology, budget entry level GPU.
GPU is really good actually:http://www.youtube.com/watch?v=hNTFTVGs4Rs
I've got a nearly equivalent 4650 sitting around. Yes, it can run Crysis ultra high, but it can also only just play light games like L4D on high as well. Sometimes it even struggled on older Source games.
I don't think you could run Left 4 Dead 2 on integrated graphics.