Just an FYI for anyone with a Samsung monitor like mine - Samsung SyncMaster 213T. On a fresh install of Fedora Core 4, I had the same problem getting DVI to work at 1600x1200 as everyone else (it worked with the 'nv' driver but not with 7664 'nvidia' one). I finally managed to get a working modeline (pulled from the log when using the 'nv' driver, which seemed to have better diagnostics).
Monitor section is as follows:
VendorName "Samsung SyncMaster 213T"
ModelName "LCD Panel 1600x1200"
HorizSync 30.0 - 81.0
VertRefresh 56.0 - 75.0
# 130.4MHz 74.1kHz 60Hz modeline
Modeline "1600x1200" 130.4 1600 1648 1680 1760 1200 1202 1206 1235
I also had to add the following line into the screen section, otherwise the 'nvidia' driver defaulted to the analog output (which was strange because the 'nv' driver had no problem defaulting to the DVI output):
Option "ConnectedMonitor" "DFP"
With that modeline it didn't need the "IgnoreEDID" option. Took a couple hours to figure out this one, so best of luck to everyone else.