Quad Buffered Stereo: which OS/consumer cards

hi All,

Have failed to find which consumer (GeForce, AMD/ATI HD series) cards will support Stereo Rendering in GL. I use OSX and WinXP/ Win7 and would like to know what i can target for broad support. I know Quadros expose Stereo, but can’t find out if anything else will do so and am pitching a project that would require Stereo.