Special AMD DoubleCard Tier (not included in any other tiers above): Get TWO Radeon HD 6770 video cards at an amazing pledge amount. If your computer supports it, you can use Crossfire technology to bind the cards together and according to AMD you’ll realize more performance than a single Radeon HD 6870 and approach the performance of a Radeon HD 6970! Or, you can keep one for yourself, and give the other to a friend or relative. You make the choice, because you’ll receive two great AMD Radeon HD 6770 video cards and all the benefits of the $15 Defense Grid 2 pledge tier as well. These video cards require a PC to have an X16 lane graphics PCI Express slot and a 450 Watt or greater power supply for one card. For Crossfire set up, the PC needs a second X16 lane graphics PCI Express slot and generally a 600 Watt or greater power supply. Cards are expected to ship to you in September 2012 or earlier. (please add $35 for international shipping of video cards). This tier is NOT included in any tier that says "previous tiers."

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