By comparison, the much-noticed "Samaritan" demonstration of Unreal Engine at last year's Game Developers Conference, required just 2.5 teraFLOPs.
By comparison to that, an Xbox 360 can handle 0.25 teraFLOPs. That means "Samaritan," which was the latest demonstration of Unreal Engine 3's capabilities, would require an Xbox 10 times more powerful than it is today. For Unreal 4, who knows what it'll take. But it suggests that the next console generation will be have to be as conspicuously more powerful in its processing capabilities as the 360 and PlayStation 3 are next to their predecessors.