AMD has launched the final DirectX 10.1-based chipset, but unfortunately this chipset was launched in May 2010.
Chipset now available in the market are AMD 790GX with DirectX 10. And this is the reason why AMD 890GX chipset to replace the support DirectX 10.1. While the 2011 chipset that supports DX 11 will be launched.
Core to the AMD 890GX graphics are not as 700MHz HD 3300 cores on 790GX chipset.