Refresh refers to the speed to which your video card will refresh the display. It affects the flicker rate of the monitor. The faster the refresh, the less your monitor will flicker. Refresh rate is measured in hertz and generally 75HZ is pretty good. Most display adapters offer two other settings which are usually "Default" (60hz-75hz) or "Optimal" which sets the refresh to the fastest rate that the detected (installed) monitor can handle. Some LCD projectors cannot handle certain refresh rates but I haven't had too much problem with modern monitors. The refresh may also change the visual size of your display since it affects both the horizontal and vertical frequencies. I usually set mine to the "Optimal Setting" but it doesn't hurt to play around and see which better suites you unless you have a VGA rather than SVGA monitor. Also if you have the improper drivers installed for your monitor, you may see adverse results. My guess is that if you don't see a problem in flicker rate on your monitor, you should be good to go ;). Refresh rate won't change any performance in your machine, renderings etc... though. If you do video editing, however, it is better to use the optimal refresh rate when outputting to video tape or any other external video recording device. ----Will