make sure that you have either:
removed mesa libs, without deps.
or
installed the rpm with the force option
check
and make sure you CANNOT see any refs to Mesa in the OpenGL version string.
Also check that the agp module (if set) has loaded at boot, you can do this with
if it hasn't then
(on 2.6.x series of kernels)
you can test if the 3D accel is working ok with
i'm running a 9700 pro x8 agp and get 3500~ fps
peace out