text: Q:
  
  How do I set the refresh rate for my CRT monitor to 100Hz and above?
  
  I am currently using a 21"FD Premium Sun Microsystems monitor. For running of experiment purposes, I would like to set the refresh rate for the monitor to at least 100hz if possible. Any clues out there?
  My current graphics card is nVidia Quadro 2200.
  
  A:
  
  xrandr should do the trick nicely.
  First, compute your modeline for your resolution and refresh rate:
  cvt 1600 900 75
  
  (Here I'm assuming 1600x900@75Hz.  Make sure you change that if yours is different.) Then create a new mode with xrandr:
  xrandr --newmode "1600x900_75.00"  104.00  1600 -hsync +vsync
  
  Add the new mode to xrandr:
  xrandr --verbose  --addmode VGA-0  "1600x900_75.00"
  
  Then enable it:
  xrandr --output VGA-0 --mode "1600x900_75.00"
  
  Note that your values will be different. Run xrandr with no arguments to find out the name of your monitor and use that instead. Running xrandr -q will display a list of available outputs.
  Here's some more information on xrandr.
  Thanks to this answer for the nitty gritty details.
  
  