Not much bottleneck should be there. I would recommend getting a 2gb version over one, as 1gb is not cutting it much anymore. It will run games like starcraft, left 4 dead, and borderlands 1 on ultra. Newer games on high/medium will give you better fps, but it wont be maxed.
Can It run WoW (World of Warcraft) on Ultra with 50-60+fps? Can it run Battlefield 3 or 4 on high with 40-60+fps?