Xrandr can't find mode

xrandr: cannot find mode 1680x1050

Screen 0: minimum 8 x 8, current 2960 x 1050, maximum 16384 x 16384
DVI-I-0 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 59.9*+
1440x900 75.0 59.9 
1280x1024 75.0 60.0 
1280x960 60.0 
1280x800 74.9 59.8 
1152x864 75.0 
1024x768 75.0 70.1 60.0 
800x600 75.0 72.2 60.3 56.2 
640x480 75.0 72.8 59.9 
VGA-0 connected 1280x1024+1680+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0 
1280x960 60.0 
1280x800 74.9 59.8 
1152x864 75.0 
1024x768 75.0 70.1 60.0 
800x600 75.0 72.2 60.3 56.2 
640x480 75.0 72.8 59.9 
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 disconnected (normal left inverted right x axis y axis)

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 304.48 (pbuilder@cake) Wed Sep 12 10:54:51 UTC 2012

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection

Section "Files"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection