Upgrading from XFree86 3.3.6 to 4.1.0

[Adam Becker <arbecker gmx net>]

I just installed RedHat 7.2 on my laptop and the installation CD only came
with XFree86 3.3.6. Xwindows wasn't working properly, and I found that
3.3.6 didn't support my SiS 630 graphics card. 4.1.0 does. So I downloaded
the 4.1.0 rpm from redhat.com and as root (in the root directory) typed
'rpm -Uv XFree86-4.1.0.i386.rpm' which seemed to work fine. However, X
still didn't work so I typed 'X -probeonly >& X.txt' which showed I was
still trying to run 3.3.6. What's the problem? Also, does it matter which
directory I install from?

How do I completely upgrade from 3.3.6 to 4.1.0? 

Thanks a lot,

Adam B.

P.S. (I sent an earlier message "Graphics Display badly configured in
RedHat 7.2 --help-- :(" about trying to fix my display. This was the
problem: uncompatible graphics card with 3.3.6)