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You mixed the resolutions on HD and UHD.
HD / 1080P has a horizontal resolution of 1920 (not 1080)
UHD 4K has a horizontal resolution of 3840
FYI : The increase from HD to UHD is 2x horizontal + 2x vertical = 4 times as many total pixels
Ouch! Sorry Dave. I’m not the most technically reliable when it comes to this kind of info. Thanks for the correction.