The higher, the better; mAV3.
So, in the Display Properties->Advanced->Monitor tab, check
Hide modes the monitor cannot display and then select the highest. Usually required @least 75Hz.
The old refresh rate of 60Hz causes the display's image to flicker, causing eye fatigue and headaches in users. The new standard of the refresh rate is 75 Hz. A min refresh rate of 72Hz eliminates the flicker. For a monitor larger than 14" diagonal measurement, 75Hz or more is a more appropriate setting.
Note that not all refresh rates are available at all screen resolutions, so if you want to crank the rate higher, you may have to sacrifice resolution.
What's ur resolution? Lower it & u might get higher refresh rates. Try other rates.
I THINK THIS IS UR CASE...
Some monitors give a blur @ 1024x768 & 75Hz, but work well @ 800x600 & 60Hz, although both r supported!!!
I've a Microtek monitor which works that way.
Just try the resolution-refresh rates combinations... something'll click.