@purple stank,what do mean by "The damage done to the card is irreverseable"...is my card damaged??!!??
The card may not be damaged at all, and you are getting artifacts due to the high temperature! But yes the card may become irreversibly damaged.
The only way you can tell is blowing some strong air flow with some external fan into the cooler until the temperature drops to desirable rates, and then test it with some modern game for a while, but always pay attention to the temperatures even in game! If the temps dont exceed the manufacturers levels and still you're getting artifacts then you probably got a bad card.