Pick DisplayPort 2.1 for a PC when your graphics card and monitor both support its higher bandwidth tiers; pick HDMI 2.1 for consoles, televisions, receivers and any monitor whose DisplayPort is older than its HDMI. Both standards can carry 4K at high refresh rates, but the winner for you is set by the weakest link in the chain: graphics card output, cable, and monitor input.
Direct verdict by device
Skip the spec sheet debate and start from what you are plugging in. A desktop PC with a recent graphics card and a monitor that lists DisplayPort 2.1 gets the most headroom from DisplayPort. A console, a streaming box, a soundbar chain or a television is an HDMI world, and HDMI 2.1 is the one that matters. A monitor that lists HDMI 2.1 and DisplayPort 1.4 should be driven over HDMI 2.1 for the highest uncompressed modes, which surprises people who assume DisplayPort always wins.
The rest of this guide explains why, shows the bandwidth arithmetic, and ends with a checklist to confirm the link you built is running the mode you paid for.
Bandwidth and how it is delivered
HDMI 2.1 introduced a fixed-rate link mode that tops out at 48 gigabits per second of raw signalling. DisplayPort 2.1 uses three tiers, called UHBR10, UHBR13.5 and UHBR20, at 40, 54 and 80 gigabits per second raw across four lanes. After encoding overhead, usable data rates are lower than the raw numbers, and the exact amount differs by standard. Our explainer on what UHBR tiers mean goes through the tier names in detail.
Both standards also support Display Stream Compression, a visually lossless method that squeezes the signal to fit when the raw mode would exceed the link. DSC is how some 4K 240 Hz monitors work on links that could not carry the mode uncompressed. It is generally invisible, though a few features, such as certain multi-monitor arrangements or older driver combinations, can behave differently with DSC active.
A key point: a port labelled DisplayPort 2.1 on a product does not guarantee the top tier. The version number says the port follows the standard, while the tier says how fast the link runs. Look for UHBR10, UHBR13.5 or UHBR20 in the specification, not just the version.
Specification comparison table
| Attribute | DisplayPort 2.1 | HDMI 2.1 |
|---|---|---|
| Top raw link rate | 80 Gbps (UHBR20) | 48 Gbps |
| Lower tiers | UHBR10 at 40 Gbps, UHBR13.5 at 54 Gbps | Several lower rates down to 18 Gbps class |
| Compression option | DSC supported | DSC supported |
| Adaptive refresh | Adaptive-Sync, used by vendor variants | Variable refresh rate, plus auto low latency mode |
| Audio return | Not a core feature | eARC for sound systems |
| Daisy-chain | Multi-stream transport on supporting monitors | Not offered |
| Typical home | PC monitors and workstations | Televisions, consoles, receivers, many monitors |
The table shows capability ceilings from the standards. A given product may implement only part of this list, so use the manufacturer’s page for the model you own.
Display modes: a bandwidth estimate table
The figures below are rough estimates for uncompressed video, using reduced-blanking timings and stated colour depths. They are meant for sanity checks, not as exact product limits. Real timings vary by monitor, and usable link capacity is lower than the raw rate because of encoding.
| Mode (estimate) | Approx. data needed | HDMI 2.1 uncompressed | DisplayPort 2.1 uncompressed |
|---|---|---|---|
| 1440p at 165 Hz, 8-bit | About 16 Gbps | Comfortable | Comfortable at any tier |
| 4K at 144 Hz, 8-bit | About 30 Gbps | Fits | Fits at UHBR10 and above |
| 4K at 144 Hz, 10-bit | About 38 Gbps | Fits, close to the limit | Fits, tight at UHBR10, easy at higher tiers |
| 4K at 240 Hz, 10-bit | About 63 Gbps | Needs DSC | Fits only at UHBR20 |
Assumptions: roughly 24 bits per pixel for 8-bit and 30 for 10-bit colour, 4K meaning 3840 by 2160, and blanking kept small. Encoding overhead reduces usable capacity on both standards, so numbers close to a limit deserve caution.
Worked example: reading your own monitor
Take a monitor whose manual lists HDMI 2.1 on one port and DisplayPort 1.4 on another, with a 4K panel rated at 144 Hz and 10-bit colour. The estimate above puts that mode near 38 Gbps. DisplayPort 1.4 offers roughly 26 Gbps of usable capacity, so it would rely on DSC or drop to a lower colour depth. HDMI 2.1 has enough room for the mode without compression, assuming the graphics card and cable both support it. In this case HDMI is the cleaner path, even though the PC would normally prefer DisplayPort.
Now flip the example: a monitor with DisplayPort 2.1 at UHBR20 and an HDMI 2.1 port, rated at 240 Hz at 4K. The estimate near 63 Gbps exceeds HDMI’s capacity, so the HDMI connection would need DSC while DisplayPort could run the mode uncompressed. Same method, opposite answer. The habit worth keeping is to calculate the mode, then compare it with each port rather than trusting a version number.
Cables and length limits
High-bandwidth cables are the most common reason a new monitor misbehaves. HDMI 2.1 modes need a cable sold as Ultra High Speed, which should carry a certification label on the packaging. An older High Speed cable can work at lower modes but may drop out at the top ones.
DisplayPort 2.1 cables are certified by bandwidth class, with names that refer to the 40 and 80 gigabit tiers. Because signal quality falls with distance, the longest runs at the top tier are harder to build, and many passive cables for the highest class are short. If your desk setup needs a long run, check the stated rating for that exact length, or consider an active or optical option designed for it.
Whichever standard you use, avoid daisy-chaining adapters, cheap switch boxes and unpowered splitters when chasing the top modes. Each extra part adds risk, and the symptoms (sparkles, black flashes, a missing refresh option) look like a monitor fault when they are really a signal problem.
PC versus home theatre ecosystem
HDMI dominates living rooms. Consoles, streaming devices, receivers and televisions all speak HDMI, and features such as eARC for sending audio back to a sound system and automatic low-latency switching were designed with that setup in mind. If you are setting up a console, our console-focused comparison of the two ports covers the choices in that context.
DisplayPort lives on the desk. Graphics cards usually offer several DisplayPort outputs and fewer HDMI ones, monitors with multi-stream support can daisy-chain, and the standard is the reference for adaptive refresh on PC. If your monitor is older, a look at DisplayPort 1.4 against HDMI 2.1 for 4K high refresh shows how the numbers change when the DisplayPort side is the older version. For mid-range screens, HDMI 2.0 versus HDMI 2.1 at 1440p explains when the newer version matters.
Conditional selection guide
| If this is true | Choose | Why |
|---|---|---|
| PC, card and monitor all list DisplayPort 2.1 UHBR13.5 or UHBR20 | DisplayPort 2.1 | Highest headroom for 4K at very high refresh |
| Monitor lists DisplayPort 1.4 and HDMI 2.1 | HDMI 2.1 | Larger uncompressed capacity for 4K high refresh |
| Console or television connection | HDMI 2.1 | Console outputs and TV inputs use HDMI |
| Sound bar or receiver in the chain | HDMI 2.1 | eARC support |
| Three or more monitors from one card | DisplayPort | More outputs and chaining options |
| Only 1080p or 1440p up to 165 Hz needed | Either | Both standards have ample capacity |
Connection verification checklist
- Read the monitor manual and note which port supports the highest mode; many monitors limit full bandwidth to one input.
- Read the graphics card specification for the output version and tier.
- Use a cable certified for the standard and tier; avoid adapters in the chain.
- Plug into the correct monitor input, then select it in the on-screen menu.
- Open the operating system display settings and check that the desired resolution and refresh rate are listed.
- If the mode is missing, update the graphics driver, swap the cable, then try the other port.
- Switch on adaptive refresh in the monitor menu and in the graphics control panel if you want it.
When to stop and call support
If a certified cable, a direct connection with no adapters and current drivers still cannot reach the monitor’s advertised mode, stop troubleshooting. Contact the monitor manufacturer with the model name, the exact mode and the port used, and ask whether the mode is supported on that input. Keep the receipt and packaging until the setup is confirmed, since a monitor that cannot reach its advertised mode on any cable may be a return case.
Frequently asked questions
Is DisplayPort 2.1 always better than HDMI 2.1?
On raw bandwidth the top DisplayPort 2.1 tier is higher, but that only matters if your monitor and graphics card both support it. Many monitors list HDMI 2.1 at its full rate while offering DisplayPort at an older version, which can reverse the winner for your specific screen. Read the port table in the monitor manual, then pick the port with the higher supported mode for your resolution and refresh rate.
Do I need a special cable for DisplayPort 2.1?
For the highest tiers, yes. Certified cables are rated for the 40 or 80 gigabit class, and an older cable may silently fall back to a lower rate or fail to show a signal. Short cables are easier to make reliable. If your monitor only needs a mid tier, a well-made certified cable you already own may work, but check the cable’s certification label first.
Which is better for a console, DisplayPort or HDMI?
HDMI, in nearly all cases. Current game consoles output over HDMI and have no DisplayPort connector, so the question is whether your monitor or television has an HDMI 2.1 input that supports the modes the console offers. Check the specific input, because some displays enable full bandwidth on only one of several HDMI ports.
Can I use DisplayPort 2.1 and HDMI 2.1 at the same time?
You can connect both to one monitor and switch inputs, or use them for two different screens from the same graphics card. Some graphics cards share clock resources across outputs, so very high modes on several screens may be restricted. The graphics card manual lists the combinations allowed, which is the document to consult before planning a multi-monitor build.
Does the cable affect refresh rate?
Yes. A cable that cannot carry the required signal rate produces symptoms such as blank screens, sparkles, dropped signals or a lower refresh rate offered in settings. If the monitor advertises a mode that does not appear, swapping to a cable certified for the standard is the cheapest first test, ahead of changing drivers or settings.
