In a 256MB video card, what is the required screen refresh rate of the monitor??

I usually used a 60 hertz of rate but my eyes get flickered every time I used the monitor, I just like to ask what is the suggested or required screen rate for an 256MB ram video card|||well i have a 22" inch wide screen, and set the refresh rate to 75.....really ya dont have to do this, as at even 60 on a lcd theres no flicker.......ctr flicker alot at 60 and under, i used to run my crt at 75, and never had a problem w/flicker...256mb of ram has nothing to do w/flickering.........scott|||Sounds like you've spent too much time at the monitor. Take more frequent breaks.... also your Video Card doesn't determine the refresh rate allowance. How fast your monitor can refresh is up to your Monitor. Look up the Specs on your monitor. Also use the handbook that came with the monitor. Do not increase the refresh rate higher then what the monitor allows or you will burn it out.