In RHL 7.3, 8.0 installation screens (both gui and text mode) there will be two screens, one for configuring the video card and the next for configuring your monitor.. these screens will consists of a list of supported cards and monitors...
Please look at the installation documentation chapter 3...
http://www.europe.redhat.com/documen...VIDEO-CARD-FIG
here is what I found from the above link...
"If your video card does not appear on the list (see Figure 3-31), X may not support it. However, if you have technical knowledge about your card, you may choose Unlisted Card and attempt to configure it by matching your card's video chipset with one of the available X servers. "
also the next page which follows is for monitor configuration...
I installed RHL 7.3 , 8.0 on my HP pavilion machines, the video card (ATI Radeon Mobility) and monitor was automatically probed as they were supported/listed...
Cheers!
Vishnu.