(be up to date)
yum install gcc
yum install kernel-devel
download nvidia drivers from webpage
reboot and when grub is booting, stop it and edit the kernel line: append 'rdblacklist=nouveau 3", this will disable the nouveau driver and set you in init 3 (just for this time)
ls to the download directory and run the installer (sh NV.. or chmod +x and ./NV..)
say yes to, everything, i can't see why not; but especially important to it modifying the X config setting.
if you want to verify: "/sbin/lsmod | grep nouveau" should return empty.