I used science to verify that indeed my new ipad pro's display can jam at 120 hz.

Exhibit A: youbeill.in/scrap/noise-120fps

Load that up in VLC for iOS, playing back at normal speed. Then get a camera that can shoot at least 120 fps - an iphone will do. Record some video of the ipad playing the above file.

Explore the camera recording using a big computer. If you can see every frame number, you did it.

Exhibit B: youbeill.in/scrap/120hz-fo-sho

(sure, cam shutter and display aren't synced)

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I made the 120 fps reference file with ffmpeg:

ffmpeg -t 10 -f lavfi -r 120 -i "anoisesrc=d=60:c=violet:r=44100:a=0.5,asplit[a][out0],[a]showwaves=r=120:mode=line:split_channels=1:s=1920x1080[out1]" -vf "[out1]drawtext=font='Arial': fontfile=Arial.ttf: fontsize=80: fontcolor=white: box=1: boxcolor=0x00000000@1: text='Time\: %{pts} Frame\: %{n}':x=30:y=30" -y 120fps.mp4

Move to the directory containing Arial.ttf first. Despite my great powers, I am routinely defeated by Windows fs paths.

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