Even if the card is not supported, you should be able to get it to run as an SVGA card. This might be a problem with your monitor not getting detected correctly, try to see in the configuration whether your monitor is listed, else choose generic monitor and run it at 640x480 and 256 colours. After it runs, you can download the latest version of XFree86 and see if you can run at enhanced settings.
BTW, which version of redhat did you use?
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Hardware - Celeron 266 MHz, 128MB RAM, Intel i740 8MB RAM
Software - Slackware Linux 10.1; Archlinux 0.7; Windows 98 SE
Humanware - GS/CS C++ L+++ w b+++ DI+ D+ e
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