i've stayed away from using monitors on their side ever since i noticed that while it doesnt hurt the game's framerate it did on my cards cause the actual frame rate to be halved or more. it was very evident with the mouse cursor latency that occured that the monitor was not receiving new frames at the usual rate. newer 3d cards may support this without this problem, but my gtx8800's were clearly not sending every frame to the monitor at the same speed or frequency. just be cautious when sinking money into it.