I just got a Samsung Syncmaster 2233 at a local store, and it's suppose to reach 120 Hz frequencies. I plan on using it with Nvidia 3D vision later on, but I don't have the hardware for that yet. In the mean time, I just want to test the monitor to see if it's working ok.
Obviously, if I set it to 120Hz I can't notice any visual difference compared to 60Hz. So how can I test if the monitor is reaching the higher frequency?