that's not entirely true, that is their terrible stock cooler, with one tiny fan that spins at an outrageous speed, with a few enclosed heatpipes.
the specs of the R9 390X are rumors, I have seen the 448Gb/s bandwidth from leaks and it does sound crazy, though I can never rely on those sources. I am waiting for the R9 295X2 to go on a price cut and then grab one of those and tri-fire with my R9 290X.