How good is this computer for gaming?

It's very good for gaming, in the future if it lags a bit you might have to buy a better video card but not yet. Newegg.com is best for prices and dependability and they don't overcharge for shipping. If you already have it you can go to this site--Canirunit-- there you can see how well your pc will play any popular game, it scans your pc to give you an accurate answer. struktz there below me knows what he's taking about.