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I was surprised to learn that many commercial HDR 4K TVs have a 50Hz real refresh rate. Sub 60Hz screens are bountiful and common.

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It's also common on a lot of mobile devices as well -- iOS can actually vary the refresh rate on a device from 30Hz (energy-efficient) to 60hz ('standard') upto 120Mhz ("ProMotion") and I'm sure Android probably does this also.

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