AMD Radeon 570 and 580 Graphics cards use Polaris 20 XL & XTX
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AMD Polaris 20 XTX, XL Chips Powering the RX 500 Series Confirmed | TechPowerUp
HEVC Decode has been removed on 19.4.3 driver (Polaris card) : r/Amd
AMD Radeon RX 580 and RX 570 TekSpek Guide | SCAN UK
AMD Radeon RX 580 To Feature Polaris 20 and RX 560 To Feature Polaris 21 GPUs