w w w . f e d o r a f a q . o r g / try this link for fedora ati problems with 3d.
i have played with mine for months and this was the only guide to work

how much ram are u using

512 meg ram

what is teh o/p of this

#x11perf -repeat 3 -reps 10 -subs 10 100 -circulate

before running this command remember to make a back up of your sorg.conf file....

asssuming everything went off well

we will get dri working

dri allows 3d acceleration

what is th eo/p of this command

#glxinfo | grep direct

also make sure the foll line is there in your xorg.conf file

Section "DRI"
Mode 0666

also in
Section "Device"
VideoRam=16384 or more

Q: How do I enable 3D support for my ATI Radeon card in Fedora Core 4? (Updated 7 May 2005)
A: There are now ATI driver RPMs provided by livna.org that are designed especially for Fedora.

NOTE: If you have nVidia drivers installed, you must un-install them before installing these ATI drivers.

If you're using yum with our configuration, you can install the drivers just by typing:

yum install ati-fglrx kernel-module-fglrx-$(uname -r)

That installs the ATI driver for your current kernel, and it should become active the next time you reboot your machine.

If you update your kernel, make sure that you install the newest ATI driver before you start the new kernel. To install the driver in your new kernel before you restart, you have to do:

yum install kernel-module-fglrx-$(rpm -q --queryformat="%{version}-%{release}\n" kernel | tail -n 1)

(That's actually just a fancy way of getting the version number of your latest kernel.)

If you have an Intel motherboard, you will have to modify your xorg.conf file after installing the drivers:

1. Open a Terminal.
2. Become root.
3. Open the xorg.conf file in a text editor:

gedit /etc/X11/xorg.conf
4. Find the line that looks like:

Driver "fglrx"
5. Add the following line right below it:

Option "UseInternalAGPGART" "no"
6. Save the file, and reboot your computer.

this is the method that worked for me
rgds