https://wccftech.com/amd-radeon-rx-6800-rdna-2-graphics-cards-official-navi-21-powered-rx-6800-xt-649-rx-6800-579/

The AMD Radeon RX 6800 series graphics cards are official and they come in two Big Navi "RDNA 2" GPU powered flavors, the Radeon RX 6800 XT and the Radeon RX 6800. The AMD Radeon RX 6800 series of graphics cards are made for enthusiasts gamers, offering huge gains over its predecessors and insane performance out of the box.

AMD's Radeon RX 6800 series graphics cards are based on the same RDNA 2 GPU architecture that is powering the rest of the Radeon RX 6000 series lineup. The main difference is that the GPU AMD decided to feature on its Radeon RX 6800 series is the fastest chip they have ever designed for the gaming segment and hence known as "Big Navi". It's the biggest gaming chip AMD has ever made on the FinFET 7nm process node and features an upgraded architecture which carries much higher efficiency and performance per watt.