problem with ati radeon 7000

I have an Ati Radeon 7000 video card and it works terrible in X because of low refresh rate. I tried to manually edit the XF86Config file in order to use 85hz refresh rate witch is supported by monitor but after that the X didn’t start.
Could someone help me fix this?

Thanks!

Try searching the Hardware forum. I think I just read a thread there about this exact thing, but I didn't see the resolution.

Is it a PCI? If so, check your XF86Config file for the following:
Section "Module"
Load "dbe"
Load "extmod"
Load "fbdevhw"
Load "glx"
Load "record"
Load "freetype"
Load "type1"
Load "dri"
EndSection

You need the "glx" and the "dri" modules loaded to make this card work.
Scroll down to the devices section and look for :

Section "Device"
Identifier "Videocard0"
Driver "radeon"
VendorName "Videocard vendor"
BoardName "ATI Radeon 7000"
VideoRam 65536
Option "ForcePCIMode" "TRUE"
EndSection

Option "ForcePCIMode" "TRUE" was all I had to add to my XF86Config to make this card work under RH9. This one line took the FPS of glxgears from the 19-21fps range up to 137-139. As for x not starting, restore the original XF86Config by typing as root:
cd /etc/X11
mv XF86Config~ XF86Config
I can post my whole XF86Config if you need it. Good luck!