AMD Radeon RX 6900 XT LC with Navi 21 XTXH GPU has been tested - VideoCardz.com
AMD Radeon RX 6900 XT's Big Navi GPU Allegedly Pictured, Massive Die To Battle NVIDIA's Ampere Flagship
AMD Navi 21 GPU Specs | TechPowerUp GPU Database
AMD Radeon RX 6000 "Big Navi" Navi 21 XT & Navi 21 XL GPU Power Figures Detailed - Up To 320W To Match The GeForce RTX 3080
Navi 12, 14, 21, and Lite variants of AMD's latest GPU range revealed in Linux driver code; RX 5800 could take on the GeForce RTX 2080 - NotebookCheck.net News
Is this a Radeon RX 6800XT (Navi 21) engineering board ?