How many Hz does HDMI support on 1920x1080?

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OWEN10578

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May 10, 2013
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Oh ok thanks, I asked cause I overclocked my monitor from 60Hz to 74Hz and I didn't know if HDMI supports more than 60Hz. So I was like "hold on a second, if HDMI doesnt support more than 60Hz what's the point of overclocking to 74Hz?"
 
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bystander

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At 1080p it is 60hz. Though HDMI 1.4b does allow frame packing for 3D up to 60hz which does have the monitor updating 120 times a second due to displaying both right and left images, but the monitor still only accepts 60 packets per second, it just gets both the right and left images in a single transmission, then splits it into two frames on the monitor.

Now it can get more confusing with the absolute latest hardware. HDMI 2.0 is going to allow for 120hz in 2D and there are some very new monitors with it, though they are all 4k as far as I know, which is limited to 60hz at that resolution and GPU's don't have support for HDMI 2.0 yet. But then Nvidia just released a driver that can allow 60hz over HDMI 1.3 or newer through compression, but only if connected to a HDMI 2.0 monitor.

Confusing times ahead.
 
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OWEN10578

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Wait, so you're telling me that HDMI only carries 60Hz ay 1080p? So my monitor overclock is useless???
 
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bystander

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HDMI 1.4b or older, can only do 1080p at 60hz, at least with factory settings. I have seen people overclock a monitor before, but they had to lower their resolution to do so. I've seen other overclocking, though I didn't think it was HDMI, but in tests, they have found that the monitor fails to update many of the frames, so it isn't really achieving the results you think.
 
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OWEN10578

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"At factory settings"? So I can change that? How? I did some frame skipping tests and it didnt skip a frame and I felt a bit less tearing in games.
 
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bystander

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When I say factory settings, I mean without overclocking. Out of the box, without modifications. Surely you understood that. The spec for HDMI 1.4b and below does not allow for higher than 60hz at 1080p. HDMI 2.0 does add that ability.

And just because the frames are not skipping, does not mean the colors and everything are 100% accurate. Though they might. I haven't seen a lot of successful overclocking with HDMI to know all the problems. I do know what is possible by the spec.
 
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OWEN10578

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Oh you mean without overclocking, so when I overclocked did the HDMI cable transport 74Hz too? I don't really feel any different about the colours, what are all the problems? Nvidia said as long as there's no weird stuff going on the monitor screen then the screen can handle it?
 
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OWEN10578

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Monitor overclocking is possible on Nvidia GPUs and it is pretty simple, just go to Nvidia control panel, click change resolution, click customize, create custom resolution and keep up the hertz by one and click apply, if it works up the hertz by one again, keep doing it until the monitor doesn't work where you back down to the last working hertz.

 
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