Though the AMD ATI enounce Radeon HD 2900 series VPU has already integrated strong physics acceleration ability, but it seems AMD ATI want to endow Radeon HD 2000 series VPUs with stronger physics acceleration ability, so they put forward unsymmetrical physics acceleration mode, composed of a Radeon HD 2000 graphic card and a Radeon X1900 graphic card, among them the Radeon HD 2000 graphic card is responsible for 3D rendering, the Radeon X1900 graphic card is responsible for physical acceleration.
The unsymmetrical physics acceleration mode can make up the relative weak physics acceleration ability of Radeon HD 2600/2400 series, it also can let Radeon HD 2900 graphic card be free from physics acceleration, and concentrate on 3D rendering tasks. The unsymmetrical physics acceleration mode has already been supported by catalyst driver.
However, if there will be a DX9 game supports ATI physics acceleration in the future, another mode in which X1900 is responsible for 3D rendering, HD 2600/2400 is responsible for physical acceleration is also a quite good choice. But AMD ATI possibly don’t support this kind of mode right now and in the near future.