Try a gtf-based modeline generator like "gtf" in the XFree86 4.3
prerelease snapshots.  Trying that, I get:

  # 1152x864 @ 100.00 Hz (GTF) hsync: 91.50 kHz; pclk: 143.47 MHz
  Modeline "1152x864_100.00"  143.47  1152 1232 1360 1568  864 865 868 915  -HSync 
+Vsync



                                Mark. 

On Fri, 7 Feb 2003, Eric Mangold wrote:

> Hi,
> 
> I'm trying to setup Xfree86 4.2.1 for use with my Elements 9D monitor and a 
> GeForce2MX 200 graphics card. It is currently working fine with the nvidia 
> driver.
> 
> The problem is that X is setting my monitor to 75Hz at 1152x864. The 
> monitor is capable of 100Hz at that resolution, and that's what I'm running 
>   at under Windows.  I've tried running "X -configure" but that doesn't do 
> anything special with regard to my monitor.  I've also played with 
> xvidtune, secifically adjusting the width and height in order to raise the 
> refresh rate a bit.  I havn't been able to make it operate above ~84Hz 
> while still being able to compensate with the physical monitor controls. In 
> other words, anything higher and I can no longer keep the picture at the 
> right physical dimensions.
> 
> Thanks in advance,
> -Eric Mangold
> 
> My XF86Config-4 file is shown below:
> 

Section "Monitor"
     Identifier    "Generic Monitor"
     HorizSync    30-95
     VertRefresh    50-150
     Option        "DPMS"
# This will get me to 84Hz, though I'll be damned if it doesn't add a
bit of distortion
#    Modeline    "1152x864"    108.00   1152 1216 1344 1428    864  865
868  900 +hsync +vsync

EndSection

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