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Mac OS CATALINA on a 2011 IMAC. I kept hearing it won't work because of the video card and would make my Mac unable to use but it is working for me.
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APPLE IMAC 21.5" CORE I5 2.5GHZ MID-2011 4GB 250 SSD SMART DVD MAC OS SIERRA: Amazon.de: Computer & Zubehör
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APPLE IMAC 21.5in CORE I5 2.5GHZ MID-2011 8GB 500GB SMART DVD MAC OS SIERRA (Renewed) : Amazon.co.uk: Computers & Accessories
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Apple iMac 27″ Mid 2011 Core i5 3.1GHz 12GB 1TB DVDCDRW Wifi macOS 10.13 High Sierra – Refresh Computers Online Marketplace
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2011 21″ iMac (HD6750M) [2nd,4C,S] + GTX 1050 Ti @ 10Gbps-TB1 (AKiTiO Thunder2) + macOS 10.13 & Win10 [NayChan] | External GPU Builds
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