AMD released Mecha HK-2207, a new DirectX 11 tech demo. You can download it at NGOHQ.
The Mecha HK-2207 real-time demo features a number of post processing effects (depth-of-field, lens flare, ghosting, aerial perspective/atmospheric, LUT, emissive and reflection) provided as an easy approach for developers and artists to adopt Microsoft DirectX 11 programming. This demo also uses a current trend in game engines utilizing deferred lighting and deferred shading allowing many more lights and rapid prototyping.
Nvidia's Igor Stanek, Senior Product PR Manager of EMEA has posted the following response on his Twitter page: "Just tested Mecha Rampage demo and I'm very disappointed. It should be DX11 tech demo, but it looks like DX8/9 with 10 years old physics. Looks like NVIDIA is last company with real tech demos. Supersonic Sled, Aliens vs Triangles or Endless City are from different galaxy."
There's a video on YouTube of AMD's Mecha HK-2207 demo and Stanek is right, this is far from a great demo to show off the capabilities of a high-end graphics card.