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Apple TV 1080p/4K Support Details, Ports: EveryMac.com
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Apple TV 4 hardware revealed: A8 chip, black remote, 8/16GB storage, same ports, no 4K - 9to5Mac
How to Compress/Convert 4K to 1080P/720P HD
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Apple TV 4K Support - How to Watch 4K Content via the new Apple TV 4
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4K to 1080p - Easily Downscale UHD 4K to 1080p in Mac/Windows
If I have a 1080p TV, is Apple TV 4K a waste? | MacRumors Forums
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