I cant comprehend how people think this card gives less heat than the 6990 while at the same time consuming more power :-/.
Ive looked at anand results and it seems card is a bit hotter than 6990, has virtually same heatsinks and heats inside of a pc more.
Its quieter because they use different fan, its by no means quiet tho.Any sensible person would change cooling on these cards to some huge radiator or water.
All in all, they are the same.One gets faster in title A, other one in title B.They Consume similar power (nv a little more) and are not quiet (nv a little quieter) .
Ati is longer, but 590 seems to have a Explode Ready feature.