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macOS 11 Big Sur on Unsupported Macs Thread | Page 457 | MacRumors Forums
macOS 10.15 Catalina on Unsupported Macs | Page 398 | MacRumors Forums
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iMac 27' (mid 2011) fix for AMD Radeon HD 6970M no video problem - YouTube
AMD Radeon HD 6970M Mac Edition Specs | TechPowerUp GPU Database
