X doesnt detect correct resolution

I have Samsung Syncmaster 206BW. It works with Nvidia jusrt fine. Now im trying ATI AH 3450. VESA driver gives wrong resolutions, it gives 1400X1050, should be 1680x1050. Sax2 -r dont help. Xorg.conf

# /.../
# SaX generated X11 config file
# Created on: 2008-10-24T00:31:06+0300.
#
# Version: 8.1
# Contact: Marcus Schaefer <sax@suse.de>, 2005
# Contact: SaX-User list <https://lists.berlios.de/mailman/listinfo/sax-users>
#
# Automatically generated by [ISaX] (8.1)
# PLEASE DO NOT EDIT THIS FILE!
#
Section "Files"
  FontPath     "/usr/share/fonts/misc:unscaled"
  FontPath     "/usr/share/fonts/local"
  FontPath     "/usr/share/fonts/75dpi:unscaled"
  FontPath     "/usr/share/fonts/100dpi:unscaled"
  FontPath     "/usr/share/fonts/Type1"
  FontPath     "/usr/share/fonts/URW"
  FontPath     "/usr/share/fonts/Speedo"
  FontPath     "/usr/share/fonts/PEX"
  FontPath     "/usr/share/fonts/cyrillic"
  FontPath     "/usr/share/fonts/latin2/misc:unscaled"
  FontPath     "/usr/share/fonts/latin2/75dpi:unscaled"
  FontPath     "/usr/share/fonts/latin2/100dpi:unscaled"
  FontPath     "/usr/share/fonts/latin2/Type1"
  FontPath     "/usr/share/fonts/latin7/75dpi:unscaled"
  FontPath     "/usr/share/fonts/baekmuk:unscaled"
  FontPath     "/usr/share/fonts/japanese:unscaled"
  FontPath     "/usr/share/fonts/kwintv"
  FontPath     "/usr/share/fonts/truetype"
  FontPath     "/usr/share/fonts/uni:unscaled"
  FontPath     "/usr/share/fonts/CID"
  FontPath     "/usr/share/fonts/ucs/misc:unscaled"
  FontPath     "/usr/share/fonts/ucs/75dpi:unscaled"
  FontPath     "/usr/share/fonts/ucs/100dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/misc:unscaled"
  FontPath     "/usr/share/fonts/hellas/75dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/100dpi:unscaled"
  FontPath     "/usr/share/fonts/hellas/Type1"
  FontPath     "/usr/share/fonts/misc/sgi:unscaled"
  FontPath     "/usr/share/fonts/xtest"
  FontPath     "/opt/kde3/share/fonts"
  InputDevices "/dev/gpmdata"
  InputDevices "/dev/input/mice"
EndSection

Section "ServerFlags"
  Option       "AllowMouseOpenFail" "on"
  Option       "ZapWarning" "on"
EndSection

Section "Module"
  Load         "dri"
  Load         "dbe"
  Load         "freetype"
  Load         "extmod"
  Load         "glx"
EndSection

Section "InputDevice"
  Driver       "kbd"
  Identifier   "Keyboard[0]"
  Option       "Protocol" "Standard"
  Option       "XkbLayout" "fi"
  Option       "XkbModel" "microsoftpro"
  Option       "XkbRules" "xfree86"
EndSection

Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[1]"
  Option       "Buttons" "5"
  Option       "Device" "/dev/input/mice"
  Option       "Name" "Logitech Premium Optical Wheel Mouse"
  Option       "Protocol" "explorerps/2"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
  Option       "CalcAlgorithm" "XServerPool"
  DisplaySize  433 271
  HorizSync    30-81
  Identifier   "Monitor[0]"
  ModelName    "SAMSUNG SYNCMASTER"
  Option       "DPMS"
  Option       "PreferredMode" "1280x960"
  VendorName   "SAM"
  VertRefresh  43-75
  UseModes     "Modes[0]"
EndSection

Section "Modes"
  Identifier   "Modes[0]"
  Modeline 	"1680x1050" 119.00 1680 1728 1760 1840 1050 1053 1059 1080 -HSync +VSync
  Modeline 	"1400x1050" 147.04 1400 1432 1600 1768 1050 1054 1058 1074
EndSection

Section "Screen"
  SubSection "Display"
    Depth      15
    Modes      "default" 
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "default" 
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "default" 
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "default" 
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection

Section "Device"
  BoardName    "Framebuffer Graphics"
  Driver       "fbdev"
  Identifier   "Device[0]"
  VendorName   "VESA"
EndSection

Section "ServerLayout"
  Identifier   "Layout[all]"
  InputDevice  "Keyboard[0]" "CoreKeyboard"
  InputDevice  "Mouse[1]" "CorePointer"
  Option       "Clone" "off"
  Option       "Xinerama" "off"
  Screen       "Screen[0]"
EndSection

Section "DRI"
    Group      "video"
    Mode       0660
EndSection

Section "Extensions"
EndSection