twinview - CRT,DFP - SecondMonitorVert

[mesters]

Goal: twinview with CRT,DFP (not just CRT,CRT) and stereo at highest possible frequency for the CRT.

Configuration: Quadro4 900XGL with DELL P1130 and DELL FP1702

Status: With the present XF86Config file, the DFP runs at 60Hz (just fine) and the CRT runs at 85Hz.

Question: how do I increase the frequency of the CRT monitor to at least 100Hz in twinview mode, the other monitor being a DFP.
Using the SecondMonitorHorizSync option does not help, error: no usefull display mode left.
Any help is appriciated.

My XF86Config:
Section "Monitor"
Identifier "Monitor[1]"
ModelName "P1130"
VendorName "DELL"
HorizSync 30-130
VertRefresh 95-170
Option "CalcAlgorithm" "IteratePrecisely"
EndSection
Section "Monitor"
Identifier "Monitor[0]"
ModelName "FP1702"
VendorName "DELL"
HorizSync 31-80
VertRefresh 56-65
Option "CalcAlgorithm" "IteratePrecisely"
EndSection

Section "Screen"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1280x1024"
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection
Section "Screen"
DefaultDepth 16
SubSection "Display"
Depth 16
Modes "1280x1024"
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[1]"
EndSection


Section "Device"
BoardName "Quadro4 900XGL"
BusID "1:0:0"
Driver "nvidia"
Identifier "Device[0]"
Option "NvAGP" "3"
Option "Stereo" "3"
Option "TwinView" "on"
Option "TwinViewOrientation" "Leftof"
Option "NoTwinViewXineramaInfo"
Option "SecondMonitorHorizSync" ""
Option "SecondMonitorVertRefresh" ""
Option "MetaModes" "1280x1024,1280x1024"
Screen 0
Option "Rotate" "off"
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

[mesters]

It seems the answer is I cannot because I donot have enough memory, only (!) 128 mb.... Buuuh.