Originally Posted by jorgenj
Of course, but as long as the temperature is well below the shutdown limit there isn't much danger of hardware damage is there?
nVidia created your card with transistors that can only take so much. The faster you turn them on and off the more stress you put on them. You potentially shorten the life of your card by overclocking.
Any improvement from overclocking is usually minimal anyway. Just save a few bucks and upgrade your card.