it is dangerous if you mess up with the voltage and go over the limit and can cause permanent damage. but there are lotsa precautions anyway so don't worry.
Originally Posted by Phinix
I wanted to know, is it dangerous to over-clock these cards?
Will the life span of the card be reduced, or can it get damaged?
Because this card is amazing plays everything full settings on my 24", and was just wondering if it would be wise to over-clock it using the ati catalyst -auto tune- utility?