Can I use PIX for Windows from the DirectX SDK with an XNA framework game?
Yes. PIX sees XNA Framework games as just another DirectX game and will expose information about the DirectX calls made by your XNA Framework game, including shader rendering. To use PIX with an XNA Framework game, start a New Experiment in PIX and enter your game executable path into the Program Path edit box. Then choose the information you want to gather and push Start Experiment. For more information on how to use PIX, see the DirectX SDK documentation.