This is the high end computer, having good graphics card and 6gb ram. u can play all games that are releasing now
modern warefare 3
mass effect and good known games
This not a high end computer , it is mid tier at best. the CPU is good, but the GPU is not. you are not playing many games with a $30 Graphics card /IGP.
you need the put $100-$150 into a good graphics card (GTX 460, HD 6850, HD 6870, HD 6790)