Hey um, 7990 is dual GPU.
So is the GTX 690. What's your point?
Sorry, I think just forgot that the 690 was also dual GPU lol, brain freezel. But none-the-less, doesn't the 7990 card use more watts, thus more heat? If he really cares about his temps, then he will have to spend more on a better cooler. But if not, then he can get the 7990, which will last him for a long and long time...