Not overclocking mine since it is my work desktop, but if I load up all 8 cores it gets moderately loud even at stock speeds. I've got the fan controls set to kick it up to full speed at 55C; under heavy load the temp sits right at 55C and the fan constantly cycles up and down between about 3/4 speed and full speed.
The years just pass like trains. I wave, but they don't slow down.
-- Steven Wilson