bignastyid :
When overloading a psu many problems can arise like the system just shutting down, failing and damaging hardware, frying the whole rign or if it's bad enough quality (and you have some really bad luck )it could catch fire and burn the house down.
NOOO. I am using a low profile card on 500 watt PSU . Also for your knowledge, the components pull energy, which is required by them, because it is watt. The risk is only of voltage, which is only 12 V .