AMD has been promising big things from its Mantle graphics API, not the least of which is that its flagship GPU will "ridicule" Nvidia's GeForce Titan in Battlefield 4 in terms of performance. As opposed to high level APIs like OpenGL and Direct3D that operate on many different devices, Mantle is a low level API focused on AMD's Graphics Core Next (GCN) architecture. There's potential to do some great things with Mantle, and that has developers excited.
The Sunnyvale chip designer said that three more developers are on board to use Mantle. They include Cloud Imperium Games (responsible for Star Citizen), Eidos Montreal (part of the Square Enix Group and the studio behind Thief), and Oxide Games (a new studio comprised of former Firaxis and Microsoft employees).
"AMD's Mantle will allow us to extract more performance from an AMD Radeon GPU than any other graphics API," said Chris Roberts, CEO, Cloud Imperium Games. "Mantle is vitally important for a game like Star Citizen, which is being designed with the need for massive GPU horsepower. With Mantle, our team can spend more time achieving our perfect artistic vision, and less time worrying about whether or not today’s gaming hardware will be ready to deliver it."
Mantle givees developers unprecedented access to GPU hardware on a low level and affords more fine grain control. It's similar in concept to coding for consoles and it should lead to better looking games, faster performance, and less buggy software out of the gate.