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In the article near the top it says

“1080p @ 60 Hz = 1920x1080x60x3 => ~370 MB/sec of raw data.”

Can someone help me understand the 60 Hz part of this? Was it meant to be fps or does it really mean Hz? And why?

The average refresh rate of a computer display is 60Hz. In this context it's interchangeable with framerate but we think of it in terms of Hz because of the monitors.

The author means 60 frames per second, which has the units of Hertz. You sometimes see this unit used for screen refresh rates in your system settings.

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