So, just bear in mind that you'll actually want to go into the monitor/resolution settings in windows and switch it to the correct refresh rate. I know that sounds silly, but the 120hz monitors I've played with all defaulted to 60hz.
Want a fun game to play with that monitor?
Plug both your monitors into the card, and do an extended desktop. Drag a window between the two monitors, and then rapidly up and down. Watch as your old monitor tears the heck out of the window, while your new monitor shows silky smooth motion.