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I'm assuming you already have X up and running, but are just wondering wether your 3D drivers are working...
Try running any fullscreen 3D program - an OpenGL screensaver for instance. If your 3D hardware is NOT working, then you'll have an incredibly low framerate. This is because witn no 3D hardware, software rendering is used.
Which video card exactly (make / model) are you using? Obvious a very high end card will have considerably better FPS rates than a lower end, generic card. That being said, as long as you're running glxgears in full screen mode, those FPS scores aren't bad. As PsychosisNode mentioned, trying to run an Open GL screensaver is another good test. Something like Euphoria (IIRC) will have smooth, continuous motion if 3D is working, and very jerky motion if it's not. -- J.W.
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