This can give you an estimate to what your PC can/can't run. It seems to fare well.
[url=http://community.futuremark.com/hardware/game_requirements_check]link[/url]
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Good. I can run Prototype to max settings. Set for life.
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I checked on another site to see if it can run the free games I listed. You're fine with that set up. Upgrading a graphics card down the line shouldn't be difficult. It's more difficult to upgrade a processor than a graphics card from what I've seen.
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Then the PC is built just fine. Processor is beefier than the graphics card.