Is this a good gaming Pc?

The cpu is alright, and it can be overclocked greatly, can hit 3.8ghz on stock voltage for the most part. This will eliminate any bottleneck between teh cpu and videocard. If you don't know how read about it. The 6770 is just a rebranded 5770, and it's an alright mid range card. Depending on your resolution that you play at will depend how easily games will max. You probably will have trouble with games like crysis 2, might need to customize settings with medium and high for games that won't play smoothly maxed. Keep AA off too for performance gains