The Polaris 30 GPU offers the same 2304 stream processors as its predecessors, but offers much higher clockspeeds. Compared with the Radeon RX 580, the base clock has been lifted from 1257MHz to 1467MHz, and the Boost got a kick from 1340MHz to 1545MHz.
The memory remains the same, 8GB GDDR5 clocked at 8GHz. AMD's official launch documentation claims the Radeon RX 590 offers 12 percent higher performance than the Radeon RX 580.
The launch pricing is said to be $279, but this is the suggested price for a non-existent reference model. This implies actual retail pricing of the custom-design cards will be a bit higher. For comparison, the Radeon RX 480 launched at $239 and the Radeon RX 580 at $229.
However, AMD is doing a "blockbuster launch bundle" with three games: Devil May Cry 5 (unreleased) The Division 2 and Resident Evil 2 (unreleased), so that adds a little bit of value.