From many years i forget to see spec like unique truth, but i see real result, i'm under mac and at difference of Nvidia which build their driver, Amd not release custom driver for mac, then when os is updated, driver is updated
anyway from years i had stress test for 3d, 3d gpu rendering, for denoise, etc and often makerting number or hardware spec not follow the result.
Often be cause developers of software not support all newer instruction of gpu (like game or 3d engine like unreal) immediately, or driver not allow you to support it (Octane with nvidia studio driver give 10% more then gaming driver for example, and gaming are newer), etc etc.
like i told i'm under mac Os, and vega64 is not so fast as i want, but... patience is my mantra, i do 3d and post from over 25 years, i ever needed patience, for every task of my work, only today with new engine like unreal i see dream come true