Re: Xbox 360 / DX10 ?
The XBox API will soon support the DX9 and DX10 interfaces. This is mainly for developer portability convenience. The XBox GPU has more features than DX9 but not all features of DX10, so those missing features will be inaccessible. For best performance or flexability, the XBox already has an extended DX interface bypassing much of the familiar Windows DX API.