Really don't use Glxgears to compare performance with new cards and other systems. Performance in glxgears depends on lots of things (color depth ....). It is unreliable for example because it doesn't use texturing. Even a pc without a 3d card but with a very fast cpu can get a "good" score. Glxgears is a nice tool to get an indication if 3d acceleration is working or not.
Really experiment with Quake3, Wolfenstein ET, UT2003 or other real games. Performance of the FX5200Ultra will be a LOT better.