I have a x800 and think I screwed something up here!
I was using the calayst 6.5 drivers
I installed the Omega drivers 3.8
The orginal problem was a shuttering or flickering in the video
during a battle the new drivers didnt help but I think that the gameplay is
more stable! Mt Frame rates are a steady 74-75. My refresh rate on the the monitor is 85Hz.
I am also using dual monitors which I known AH doesnt support, but I did
like the cloned two monitor mode in the calayst 6.5 drivers.
I understand tha tyou have a X800 ATI card also! What drivers did you use
and what settings do you have?
My Hardware:
 
System Manufacturer: Gateway
       System Model: W3410
               BIOS: Phoenix - Award BIOS v6.00PG
          Processor: AMD Athlon(tm) 64 Processor 3200+,  MMX,  3DNow, 
~2.2GHz
             Memory: 1534MB RAM