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/Amd
ASRock AMD Phantom Gaming D Radeon RX570 4G | eBay
AMD Radeon RX 7900 XT / XTX review: 4K performance for less - The Verge
Used - Like New: XFX Radeon RX 570 8GB DDR5 PCI Express 3.0 CrossFireX Support Video Card RX-570P8DFD6 GPUs / Video Graphics Cards - Newegg.com