Maya includes two hardware plug-ins that you can use to create hardware shaders, CgFX and HLSL.
To see CgFX and HLSL shaders, you must have a supported video card. As well, your Scene View must be in hardware textured mode.
Only the hardware renderer can render these hardware shaders.
You should only use graphics cards that are qualified for Maya and supports HLSL and GLSL. Check the Autodesk website (www.autodesk.com/qual-charts) for the most accurate information about qualified hardware.
You cannot use CgFX or HLSL shaders that contain certain effects in Maya: