Частота 50Гц, и все ((((

Не получается сменить частоту экрана, пробывал по разному,помогите плз, драйвера нвидиа ругаются вот так:

(--) NVIDIA(0): Connected display device(s) on GeForce 7300 GT at PCI:5:0:0: 
(--) NVIDIA(0):     Samsung (CRT-0)                                          
(--) NVIDIA(0):     NVIDIA TV Encoder (TV-0)                                 
(--) NVIDIA(0): Samsung (CRT-0): 400.0 MHz maximum pixel clock               
(--) NVIDIA(0): NVIDIA TV Encoder (TV-0): 400.0 MHz maximum pixel clock      
(--) NVIDIA(0): TV encoder: NVIDIA                                           
(II) NVIDIA(0): Assigned Display Device: CRT-0                               
(WW) NVIDIA(0): No valid modes for "1024x768_75.00"; removing.               
(WW) NVIDIA(0):                                                              
(WW) NVIDIA(0): Unable to validate any modes; falling back to the default mode
(WW) NVIDIA(0):     "nvidia-auto-select".                                     
(WW) NVIDIA(0):                                                               
(II) NVIDIA(0): Validated modes:                                              
(II) NVIDIA(0):     "nvidia-auto-select"                                      
(II) NVIDIA(0): Virtual screen size determined to be 1024 x 768               
(--) NVIDIA(0): DPI set to (92, 92); computed from "UseEdidDpi" X config      
(--) NVIDIA(0):     option                                                  

xorg.conf:

Section "ServerFlags"                                                        
    Option "AllowEmptyInput" "false"                                         
    Option "AutoAddDevices"  "false"                                         
EndSection                                                                   

Section "ServerLayout"
        Identifier     "X.org Configured"
        Screen      0  "Screen0" 0 0     
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
EndSection                                       

Section "Files"
        ModulePath   "/usr/lib64/xorg/modules"
        FontPath     "/usr/share/fonts/misc/" 
        FontPath     "/usr/share/fonts/TTF/"  
        FontPath     "/usr/share/fonts/OTF"   
        FontPath     "/usr/share/fonts/Type1/"
        FontPath     "/usr/share/fonts/100dpi/"
        FontPath     "/usr/share/fonts/75dpi/" 
EndSection                                     

Section "Module"
        Load  "extmod"
        Load  "dbe"   
        Load  "record"
        Load  "dri"   
        Load  "wfb"   
        Load  "xtrap" 
        Load  "glx"   
        Load  "freetype"
EndSection              

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option      "Protocol" "auto"
        Option      "Device" "/dev/input/mice"
        Option      "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Samsung"
        ModelName    "SyncMaster 550s"
        Modeline "1024x768_75.00"  81.80  1024 1080 1192 1360  768 769 772 802  -HSync +Vsync
EndSection

Section "Device"
        Identifier  "Card0"
        Driver      "nvidia"
        VendorName  "nVidia Corporation"
        BoardName   "G70 [GeForce 7300 GT]"
        BusID       "PCI:5:0:0"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        DefaultDepth 24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes "1024x768_75.00"
        EndSubSection
EndSection