Created attachment 254636 [details]
SaX2 Log

Thanks. I'll try to reproduce with a similar card (8400 GS).

I don't see this issue on my 8400 GS with a CTX 1280x1024 monitor digitally connected. Tried with your xorg.conf. Screen comes up with 800x600 as expected.
I suggest to remove the following lines from your xorg.conf:

 HorizSync    20-46
 Option       "PreferredMode" "800x600"
 VertRefresh  50-60

and replace

  SubSection "Display"
            Depth      24
            Modes      "800x600" 
  EndSubSection

with

  SubSection "Display"
            Depth      24
            Modes      "1680x1050" 
  EndSubSection

Does this help? Please attach new Xorg.0.log. Thanks.

?

Ok I check this, but I have a other SaX2 created config ?

The Test is starting in 1 - 2 Hours

# /.../
# SaX generated X11 config file
# Created on: 2008-11-22T10:42:48+0100.
#
# 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         "freetype"
  Load         "dbe"
  Load         "dri"
  Load         "glx"
  Load         "extmod"
EndSection

Section "InputDevice"
  Driver       "kbd"
  Identifier   "Keyboard[0]"
  Option       "Protocol" "Standard"
  Option       "XkbLayout" "de"
  Option       "XkbModel" "microsoftmult"
  Option       "XkbRules" "xfree86"
  Option       "XkbVariant" "nodeadkeys"
EndSection


Section "InputDevice"
  Driver       "mouse"
  Identifier   "Mouse[1]"
  Option       "Buttons" "17"
  Option       "Device" "/dev/input/mice"
  Option       "Name" "Microsoft Wireless Optical Desktop? 2.10"
  Option       "Protocol" "explorerps/2"
  Option       "Vendor" "Sysp"
  Option       "ZAxisMapping" "4 5"
EndSection


Section "Monitor"
  Option       "CalcAlgorithm" "XServerPool"
  DisplaySize  451 338
  HorizSync    30-83
  Identifier   "Monitor[0]"
  ModelName    "LG L227W (DIGITAL)"
  Option       "DPMS"
  Option       "PreferredMode" "1280x1024"
  VendorName   "LG"
  VertRefresh  56-75
  UseModes     "Modes[0]"
EndSection


Section "Modes"
  Identifier   "Modes[0]"
EndSection


Section "Screen"
  DefaultDepth 24
  SubSection "Display"
    Depth      15
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      16
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      24
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  SubSection "Display"
    Depth      8
    Modes      "1280x1024" "1280x960" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480" 
  EndSubSection
  Device       "Device[0]"
  Identifier   "Screen[0]"
  Monitor      "Monitor[0]"
EndSection


Section "Device"
  BoardName    "GeForce 8500 GT"
  Driver       "nv"
  Identifier   "Device[0]"
  Screen       0
  VendorName   "NVidia"
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"
  Option       "Composite" "off"
EndSection

Ok. So SaX2 saves another config as it writes for startup. In this case remove

  HorizSync    30-83
  Option       "PreferredMode" "1280x1024"
  VertRefresh  56-75

and replace

  SubSection "Display"
      Depth      24
      Modes      "1280x1050" [...]
  EndSubSection

with 

  SubSection "Display"
      Depth      24
      Modes      "1680x1050"
  EndSubSection

OK, now I tested it.

On my system Sax is not starting correct :(.

The Monitor is going out of Sync

Instead of starting SaX please try starting Xorg directly and attach new Xorg.0.log.

You mean init 3, startx ?

OK the log is attached.

Created attachment 254956 [details]
The startx Log

Ok. Monitor again out of Sync when using startx?

No, it is only with SaX2 out of sync 81.3/65Hz ?

the Monitor have
HR 30-83
VR 56-75

I start hwinfo --monitor, is hwinfo broken ?

techz:/ # hwinfo --monitor
34: None 00.0: 10000 Monitor
  [Created at fb.71]
  Unique ID: rdCR.EY_qmtb9YY0
  Hardware Class: monitor
  Model: "Generic Monitor"
  Vendor: "Generic"
  Device: "Monitor"
  Resolution: 800x600@75Hz
  Driver Info #0:
    Max. Resolution: 800x600
    Vert. Sync Range: 50-90 Hz
    Hor. Sync Range: 31-48 kHz
  Config Status: cfg=no, avail=yes, need=no, active=unknown

For some reasons the monitor cannot be detected by hwinfo. Then SaX2 make some weird assumptions, which result in 

  HorizSync    20-46
  VertRefresh  50-60

for xorg.conf used by sax2 to start the Xserver. But it seems these get ignored by nv anyway. So you still should have a working SaX2. I curently don't understand this behaviour.

Since I cannot reproduce this issue at all I'm afraid you need to live with that now. The easiest for you at the moment is to run 'sax2 -a -r', then adjust
HorizSync, VertRefresh and resolution as mentioned before and then to do the finetuning on top of  a running Xserver. Basically this is a duplicate.

*** This bug has been marked as a duplicate of bug 440973 ***