A new leak suggests the Samsung Galaxy S21 Ultra could achieve what its predecessors could not: reach 120Hz refresh rate at the phone’s maximum WQHD+ resolution.

The proof is in the screenshot: noted leaker @UniverseIce tweeted a capture of the settings page, allegedly taken on a Samsung S21 Ultra, which shows display options looking a lot like those on the Samsung S20 series of phones – except the ‘Screen resolution’ option is set to the phone’s maximum (WQHD+, 3200 x 1440) while the ‘Motion smoothness’ is set to ‘Adaptive.’

Last year’s S20 phones only allowed the former if the latter was explicitly set to 60Hz; conversely, the screen refresh rate could be set to 120Hz if the resolution was dialed down to Full HD (2400 x 1080).
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https://www.techradar.com/news/samsung-galaxy-s21-ultra-may-finally-reach-120hz-at-its-highest-wqhd-resolution