As far as I know ATI FBO support is still under development ( even NVIDIA uses beta drivers for it ). But yours results are really strange..I tested this demo on old geforce fx5200 and i had about 5,5 FPS and this card really can't be compared to x800
...I dont think that using FBO can make sutch a great difference.
note to Abba: as it was already mentioned. When I have in my settings Anisotropic filtering selected to app-contolled then your demo doesn run correctly.. maybe you should place a note about it ( or of course fix it
) ..but still great work ..i didn't expect to run it on 5200 but it surprised me