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It does and does not support 444 chroma. I bought the tv to try it out. When setting the hdmi mode to 2 it will accept an RGB 60hz 4k signal. There are weird pixel issues, even though these pictures are from a different tv, these are the exact same pixel issues: https://hardforum.com/threads/insignia-4k-43-roku-hdmi-4-4-4-cheap-and-4-4-4.1893852/page-4#post-1042212190
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