What are your other specs, what resolution is your monitor and how much money are you willing to spend?
this is the computer i am buying i needed to keep it cheap
AMD CPU - Windows 7 - Athlon II - Quad-core - 4 GB RAM - 3 GHz - 1000 GB HDD - With DVD Drive - AMD GPU
530$
you should be good at 1280X720 resolution and low settings.I have played the game and trust me even at 25 fps its sliky smooth.This game is one of those rare PC optimised games due to which its the only game apart from crysis to be playable at low fps