Overclocking - Worth It?

Is it worth overclocking my CPU?

Does it really make that much difference? Surly a few hunderd mhz can’t be that much faster?

Will it significantly speed up rendering in 3ds max?

I’m rendering something at the moment, been rendering for a few hours and my CPU is running at 63 degrees, the case at 46. Would overclocking it be dangerous, I only have 1 fan (which is currently doing over 2700 RPM).