GPU: Direct3D 9.0c with Pixel Shader Model 2.x, and Vertex Shader Model 3.0. OS: Windows 7+ 圆4, or x86-64 Linux with Wine. Many people have taken advantage of the fact that the Xbox is so similar to a pc to trick others that their emulator was real when in reality it did nothing or was a virus. Cxbx-Reloaded is an emulator for running Microsoft Xbox (and eventually, Chihiro) games on Microsoft Windows and Wine.
You can also find many homebrew applications and emulators that run ON the Xbox. It uses modified x86 compatible hardware and thus it is possible to write an emulator for it.