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I am unable to answer the 1st question but yes unfortunately this tv does have dirty screen effect. It has definite vertical bands that can be seen in dark scenes.
Sorry, there was a problem. Please try again later.8K is not widely (if at all) available via streaming. I spoke with my son who is an avid gamer and he said it isn't much of a deal in that environment. If you split your source you are likely to suffer signal degradation unless you insert a device too boost said signal.
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