There was a post elsewhere on this site that TV Out didn't work for the other driver. So I switched to 8178 using Jarod's HowTo for Fedora Core 4. It turns out it is easy to have multiple NVidia drivers and to switch between them.
Instructions for FC4 are here...
The command "init 3" hung my machine so I skipped it on the next try and it worked.
CPU usage to watch standard def TV with Picture in Picture on my Celeron D (not M) is 15%. I have two Hauppauge 150's doing the tuning in hardware.
MythTV rules (if you have the time and patience).