I have PNY Verto GeForce4 MX440. It works just fine in Linux. The problem is the TV-Out can only be set to 800x600 max but that seems to be a bug in previous NVIDIA drivers. A new version just came out 4 days ago mentions this bug has been fixed.
You need to configure the file /etc/X11/XF86Config properly. There are many threads in this forum that can help you out.
Here is one place that might be best to serve you.
http://www.sorgonet.com/linux/nv-online/
Hre is something to put in the /etc/X11/XF86Config file, section "Device"
Driver "nvidia"
Option "NvAGP" "1"
Option "NoBandWidthTest" "TRUE"
Option "NoPowerConnectorCheck" "TRUE"
Option "Twinview" "TRUE"
Option "TwinViewOrientation" "Clone"
Option "SecondMonitorHorizSync" " 30 50"
Option "SecondMonitorVertRefresh" "60"
Option "MetaModes" "1024x768 , 1024x768"
Option "ConnectedMonitor" "CRT , TV"
Option "TVOutFormat" "SVIDEO"
Option "TVStandard" "NTSC-M"