NVIDIA is running a special promotion that will allow folks to download a free full version of Batman: Arkham Asylum for a limited time if you buy a card based on one of three Nvdia graphics chip. The promotion is limited to buying a card with Nvidia's GeForce GTX 260, GeForce GTX 275 or GeForce GTX 285 graphics chips. If you buy a card with any of those chips you will get a coupon that will allow you to download a free copy of the Rocksteady-Eidos super hero game. The PC port, which support's Nvidia's 3D Vision tech and PhysX game physics, is scheduled for release on September 15.