NVIDIA announced Physics for their SLI cards this week, AGEIA presented their first PhysX cards and today ATI says it'll do physics too.
Regarding Havok, while we’re not making any announcements at the show, I can tell you that ATI will support all major physics engines. The beauty of ATI’s X1K architecture is that it gives game developers unmatched processing power for physics – it’s got everything you need to push parallel processing hard: powerful MIMD multithreaded engine, strong performance in dynamic branching, and low latency. All that gives developers the creative freedom to push the limits of realistic physics in their games. So we’re supporting the big players, and we’re delivering superior performance. As for specific cards and CrossFire, you can bet that we’re exploring all the options when it comes to physics on the GPU.