Can you actually set a max FPS?

I think it can be done by linking the vertical sync rate to the FPS rate, but if you run your monitor at 80Hz then that would set your max FPS to 80 too... Not being that interested in showing 80FPS and not having a GPU capable of such a feat (at 1280x1024) I'd rather set my max FPS to say 30, which would I think mean each client would have greater share of GPU... (or something.)