Use the HDMI input that your exact TV or monitor model lists as supporting 4K at 120 Hz. There is no universal answer such as “HDMI 1”: port capabilities vary by model and regional variant. Check the display’s port chart, enable any required Enhanced or 4K120 signal format, and make sure the source and every device in the connection chain support the features you want.
How to identify the right HDMI port
- Find the display’s exact model number and regional variant. Open its official manual or support page and look for the HDMI input capability table. Port layouts can differ across models; Sony, for example, directs users to a capability matrix by model year and series: Sony’s HDMI signal format guidance.
- Match the source’s output to a physical input. Choose a port explicitly marked for “4K 120Hz,” “4K120,” or an equivalent capability. Check the table for HDR and VRR support too, if you plan to use them. Do not assume all ports have the same maximum resolution or refresh rate.
- Set that input’s signal format if required. In the display’s HDMI signal-format settings, select the model’s appropriate Enhanced, 4K120, or VRR mode. Labels and menu paths differ by manufacturer and model. Sony’s console guidance explains the relevant port labels and signal-format options: Sony Help Guide: Video game consoles.
- Connect the source directly while troubleshooting. If a receiver or soundbar sits between the source and display, confirm that its HDMI input and video passthrough support the same resolution, refresh rate, HDR, and VRR features. A limitation anywhere in the chain can prevent the desired output; check the manuals for each device.
- Check the source’s output status. A capable input alone does not guarantee 4K at 120 Hz for every game, PC mode, HDR format, or feature combination. The source, display, cable, content, and any intermediate device all affect the available modes.
Why the HDMI number is not enough
“HDMI 1,” “HDMI 2,” and similar labels identify sockets, not a universal set of capabilities. A TV may have only certain inputs enabled for 4K at 120 Hz, HDR, or VRR. HDMI version branding is not a substitute for the display’s port-by-port specifications: HDMI Licensing Administrator says that if a TV is labeled HDMI 2.1 and one or more ports support 4K@120, the TV needs to state that: HDMI.org: HDMI 2.1 Products Will Drive Home Entertainment Sales This Holiday Season.
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For a console, confirm that the console itself supports the mode as well. Sony says PS5 supports HDMI 2.1 and 4K 120 Hz output, but the selected display input must also support it: PlayStation 5 4K resolution guide.
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Choosing a cable for 4K at 120 Hz
Follow the console or display manufacturer’s cable guidance. For a console that supports 4K at 120 Hz, Sony recommends the included cable or an Ultra High Speed HDMI cable: Sony Help Guide: Video game consoles. HDMI.org identifies uncompressed 4K at 120 Hz with HDR as a feature supported by the Ultra High Speed HDMI cable category: HDMI.org: Ultra High Speed HDMI Cable.
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You do not need to replace a working cable automatically. If the desired mode is missing, first check the display’s input setting and the specifications for every device in the chain. Consider a suitable Ultra High Speed HDMI cable if the existing cable is damaged, unsuitable, or the manufacturer’s guidance calls for one.
How to handle eARC or ARC
If you use a soundbar or audio system with eARC or ARC, connect it to the TV input marked “eARC/ARC.” Sony’s terminal guide specifies that connection: Sony Help Guide: Connecting terminal. That label does not by itself establish whether the same input also accepts 4K 120 Hz video. Check the TV’s port chart before assigning that input to a console or PC, and consult both devices’ manuals if you need to share high-bandwidth ports or use a different wiring arrangement.
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If your console or PC only offers 60 Hz
- Check the display’s official port table and move the source to an input documented for 4K at 120 Hz.
- Enable the required Enhanced, 4K120, or VRR signal format for that specific input.
- Temporarily bypass a receiver or soundbar and connect the source directly to the display.
- Verify that the source, cable, and each intermediate device support the intended resolution, refresh rate, HDR, and VRR combination.
- Check the source’s output-status screen again after changing the connection or settings.
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