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Incase anyone ever needs the answer…I have a 27” 2010 iMac working in Target Display Mode with a M1 MacBook Pro using a miniDP to USB C adaptor that's capable of 4k60Hz.
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Apple iMac 27" Core i7 3.4GHz - 32GB 1TB SSD MD063LL/A - Top Seller! Warranty !! 885909489596 | eBay
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