What things do you for gaming

What things do you look for that needs to be good in order to play games like COD Modern Warefare 2, WorldofWarcraft, etc. Just some great graphic games that you want to play on a good computer that can run it. Things like you look for are maybe? (RAM, Graphic Card, Memory, etc.) And tell me how much do you need (2 GB RAM?)

Actually everything. CPU, RAM, GPU. The norm today is probably 4GB of RAM. COD MW2 would also run well with a decent graphic card.

how you know if a graphic card is good enough?

You can check the bench mark or the game's system requirements.