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I've read that for a lot of 120Hz, 144Hz and higher refresh rate, you have to use DisplayPort output from the GPU, and sometimes even 2 at the same time if the resolution is very high. But if I'm looking for a FullHD monitor with 144Hz refresh rate, can I use HDMI? Or does it depend on each monitor's model?

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    HDMI 2.1 is fully capable of 4K 120 Hz refresh rates. You would have to look at the monitor’s specifications to determine if a given monitor supports it though. – Ramhound Jun 1 '18 at 20:40
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It depends on the HDMI version. You'll need HDMI 1.3 or above for 1080p and 120 Hz or more.

EDIT: Your monitor and graphics card do still need to support a 120 or 144 Hz refresh rate at the resolution you desire. DisplayPort works too.

The Wikipedia article has a really useful table:

HDMI refresh rates table

Source: https://en.wikipedia.org/wiki/HDMI#Refresh_frequency_limits_for_standard_video

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  • Both the monitor and the GPU have to match this spec, right? – user1306322 Jun 1 '18 at 21:07
  • @user1306322 Of course – Ramhound Jun 1 '18 at 21:09
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HDMI supports 1080p 120hz, although it cannot use a 1080p 144hz mode. For that, a DisplayPort cable is required.

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