Wait a second...You see it every few years on major games.
If you turn v-sync off you will need to take extra steps to ensure you don't accidentally burn out the player's video card or CPU, both of which have happened with badly-developed games.
What kind of hardware was that? The hardware should slow down in the worst case (due to running out of processing time) o_O That looks more like faulty hardware or hardware not running under the proper conditions or something like that.
Starcraft 2 had v-sync disabled on their main menus with no delay in place. It burned out quite a few cards. http://www.gameinformer.com/b/news/archive/2010/07/28/blizzard-confirms-starcraft-ii-overheating-bug.aspx