CS 312 -- Jacob Lundberg

Info on the ATI video cards

 Technical Specifications
 The current list of supported cards in Xfree86
 ATI Adapters README for XFree86

It seems that RedHat 6.0 uses XFree86 3.3.3, so it might be worth trying 3.3.5, which was just released.  However, some ATI chips (like the Rage 128) are unsupported. See link three on the ATI README.