HDMI 4K 120Hz Only available on next-generation consoles and high-end gaming PCs, a 4K 120Hz HDMI cable solution for this kind of experience does exist, but you'll need the latest standard has to offer: HDMI 2.1.
Standard HDMI: Up to 720p or 1080i resolution at a 30Hz refresh rate. High Speed HDMI: Up to 4K resolution (including 1080p) at a 30Hz refresh rate. Premium High Speed HDMI: Up to 4K resolution with high dynamic range (HDR) at up to a 60Hz refresh rate.
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New Supported Resolutions and Faster Refresh Rates
However, the main advantage of having HDMI 2.1 support on a 4k TV is that it can support 4k @ 120Hz content, which is what the newer gaming consoles output.
Thus, HDMI 2.0 is strong enough to produce 4k video at 50 and 60 FPS respectively. But it's 4k@120Hz or 4k@144Hz that actually pumps energy in the video. Unfortunately, you can get this with HDMI 2.0. Yet, there is a quick trick that may stop you from undue spending to upgrade to HDMI 2.1.
As long as you have at least HDMI 1.4, 120Hz is doable on your compatible TV or monitor. You can even do up to 144Hz if your display supports it. For uncompressed higher resolutions, though, HDMI 120Hz connections need a next-generation HDMI connection.
HDMI 1.4 – If you want your HDMI cables to support 4K resolution, you need to make sure that they are High-Speed HDMI cables. They are tested to transmit video resolutions from 1080p to 4K with a richer color palette. With or without HDR, you need High-Speed HDMI cables.
For resolutions near 4K, it's recommended to use an HDMI cable that is no longer than 3 meters (10 feet). After that distance, the signal can start to degrade. For lower resolutions, the reliable distance is much longer, with the most common being 15 meters (50 feet).
HDMI 2.0 has a bandwidth capacity of 18 Gbps (gigabits per second). HDMI 2.1 takes the number up to 48 Gbps, which means that HDMI 2.1 does not have to compress that much of the data and preserve a better data quality during the transmission process.
Can any HDMI support 120Hz? As long as you have at least HDMI 1.4, 120Hz is doable on your compatible TV or monitor. You can even do up to 144Hz if your display supports it. For uncompressed higher resolutions, though, HDMI 120Hz connections need a next-generation HDMI connection.
There is no Such Thing as a 120Hz / 240Hz HDMI Cable
The truth is, these higher refresh rates are being handled by the display, not by the source.
The higher the number, the smoother the screen will appear to the human eye. This means that a 120Hz display – which updates itself 120 times a second – will look noticeable slicker and more natural than your average 60Hz screen which only updates itself 60 times a second.
120Hz Displays Don't Need “120Hz” HDMI Cables
It is created at the display from a 60Hz signal. You simply want to ensure that the HDMI cable you choose is certified to handle the data you want to send across it—for the entire distance you want to send it.
If you are wondering about whether your existing HDMI cable will work, it is possible that you will not need to upgrade to one that is “4K-compatible.” Any HDMI cable up to five meters in length labeled “high speed” should be able to handle the increased bandwidth of 4K signals.
With HDMI 2.1, we can get 4K at 120Hz, 8K at 60Hz, and right up to 10K resolution for industrial and commercial applications. This is particularly great news for gamers, as higher frame rates mean smoother, better-looking games.
HDMI versions
Supports 3840x2160 (4K UHD) with a refresh rate of 120Hz, or 120 frames per second. Supports 7680x4320 (8K) with a 60Hz refresh rate, or 60 frames per second. The standard in PlayStation 5 and Xbox Series X. 48Gbps bandwidth.
HDMI 2.1 is only needed if you want to use HDMI with 4K over 60Hz. This applies to consoles, as on PC you can get the same performance with DisplayPort 1.4, which is readily available.
You don't absolutely need HDMI 2.1 to reach 120Hz or even 144Hz refresh rates, but it is important for supporting both high refresh rates and high resolution at the same time.
Games in 4K 60Hz with HDR work perfectly on premium HDMI (HDMI 2.0), with room to spare. Note that the PS5/Xbox Series X|S ship with an ultra high speed HDMI cable (HDMI 2.1), so if you have that, use it. All HDMI versions are backward compatible.
The HDMI standard is capped at 60 Hz @ 1080p and 120Hz @ 720p. To get true 120/144Hz @ 1080p, you need to use a DVI-D or a display port cable. Perhaps when the new generation of Ultra High Speed HDMI cables rollout, they will allow us to run CS at higher refresh rates.
On its own, HDMI 2.1 can only hit 120 Hz at 4K resolution, but by using VESA's Display Stream Compression (DSC), it should be able to reach 240 Hz, as explained by Tom's Hardware. Similarly, DisplayPort 1.4a runs 4K content at up to 120 Hz natively, but with DSC, a supporting 4K display could surpass that.
The easiest way to figure out if an HDMI cable is 4K compatible is to check its speed rating or its maximum bandwidth. A cable rated at 18 Gbps maximum bandwidth is fast enough to give you 4K video. If your HDMI cable is labeled “high speed,” it should be able to pass a 4K signal at lengths of up to three meters.
Can a very expensive HDMI cable show a better picture and sound quality than a cheaper one? The quick answer is no. An HDMI cable, regardless of the materials used, can either transmit a signal or not – there's no in-between. An expensive HDMI doesn't produce richer colors or crisper sound than cheaper versions.