Cryostasis features the NVIDIA PhysX engine, which is the most advanced physics engine available. PhysX runs off of your video card. Due to the incredible amount of PhysX calculations in the game (especially after the patch), this game requires more GPU power than the Crysis games. So those who can't run the Crysis games will not run Cryostasis. Cryostasis benefits greatly from a dedicated PhysX processor.