Depending on the test, this is not unusual.
The +50% power limit is often not enough for the power the card can draw in demanding tests at significant OCs with high voltage.
Also, 72C is pretty high for a water cooled part.
...rightful liberty is unobstructed action according to our will within limits drawn around us by the equal rights of others. I do not add 'within the limits of the law,' because law is often but the tyrant's will, and always so when it violates the right of an individual. -- Thomas Jefferson