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Hi Dave, Thank you for your interest in the Hisense 75U8K. The HDMI 1 and 2 ports support 4K at 60 Hz, and HDMI's 3 and 4 support 4K at 144 Hz. If you have any further questions or concerns, please give us a call at 1-888-935-8880 or email us at [email protected]. Thanks again, Harley with the Hisense Support Team.
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