I tested the RX 570 vs the 5500XT in a really heavy cpu limit (A10-7850k @100%). Some games do benefit from the rdna arch with slightly better minimum frames :) : r/realAMD
AMD Radeon RX 5500 XT 4GB vs. 8GB | TechSpot
Metro Exodus, Strange Brigade, & Total War - The AMD Radeon RX 5500 XT Review, Feat. Sapphire Pulse: Navi For 1080p