I had (up till today) problem with my NVidia, what ever I described in xorg.conf, output was 60Hz.. 
Command what fixed everything:

    Option       "FlatPanelProperties" "Scaling=Native"

in Section "Screen"

Now,
#> DISPLAY=:0 nvidia-settings -nt -q RefreshRate
50,00 Hz
#>

JJussi
On 27.08.2010 12:14, Jukka Tastula wrote:
On Friday 27 August 2010 11:32:11 Goga777 wrote:

if you disabled full gpu scaling , how upscaling will work really ? what and
how will upscale SD video to 1080p ?
This setting is only useful if your display device can't scale on its own or 
the scaling is worse quality. If you enable it the card will always output 
native resolution at native refresh.

If disabled the gpu will not touch the mode and output whatever you tell it 
to, in which case the display itself will have to scale the mode as needed.


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