I think this depends on the source and the refresh rate of what you're using as a display. Full HD 3D is full 1080p, with 60hz effective refresh rate to each eye. However, that's only available from a 3D BluRay player or certain Nvidia configurations at this point, I believe. The majority of other sources are SBS (side by side) or Top-Bottom, with the display device or some hardware stretching the half picture to full and alternating between the two images. You only get a half resolution display to each eye (vertically or horizontally, depending on format) when you do this, regardless of the refresh rate of the viewing device.
All of the above is for active shutter tech. If you're using anaglyph or polarized lenses, you only need 60hz refresh since all the information for each eye is in every frame.