Win XP force you?¢_Tre applications to use 60Hz refresh rate, it shouldn?¢_~t cause flickering, but does tire the eyes. Flickering (or rather tearing) is caused by not using VSync. You can control VSync from you?¢_Tre application, but it should usually be left to decide for the user. NVIDIA drivers can override both VSyncing and refresh rates, I?¢_Tm not sure about ATI drivers.