Also your PC needs 4 GB RAM to meet the rec specs and run at 60 frames. Zero Gravity needs a Core 2 Duo E7500 2.93GHz or Athlon II X3 460 processor coupled with a GeForce GTX 260 to run Zero Gravity system requirements at minimum requirements. A machine of this performance will return around 30FPS on low settings. Your PC needs 2 GB system memory as well for min. Your graphics card will need to be capable of running DirectX 11.
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