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.
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Gallery: Batman: Arkham Asylum Screenshots