The cable between your GPU and monitor sets a hard ceiling on resolution and refresh rate, so the HDMI 2.1 versus DisplayPort 2.1 question is more important than it looks. Modern graphics cards carry both, and picking the right output for your display unlocks its full potential — while the wrong one can quietly cap you at a lower refresh rate than you paid for.
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Bandwidth is the whole story
Both standards carry video; the difference is how much data they push. HDMI 2.1 provides up to 48 Gbps, comfortably enough for 4K at 120 Hz. DisplayPort 2.1 (in its UHBR modes) reaches up to 80 Gbps, which is what you need for 4K at 240 Hz or high-refresh ultrawide and 8K displays without heavy compression. For most gamers today, both handle 1440p and 4K/120 fine; the ceiling only matters at the extremes.
Display Stream Compression
Both standards can use DSC, a visually lossless compression that squeezes higher resolutions and refresh rates through the available bandwidth. DSC is why a 4K/240 Hz monitor can work over HDMI 2.1 despite exceeding its raw uncompressed limit. In practice DSC is imperceptible, so do not avoid a monitor just because it relies on it.
HDMI 2.1 vs DisplayPort 2.1
| Spec | HDMI 2.1 | DisplayPort 2.1 (UHBR20) |
|---|---|---|
| Max bandwidth | 48 Gbps | 80 Gbps |
| 4K @ 120 Hz | Yes | Yes |
| 4K @ 240 Hz | Yes (with DSC) | Yes |
| Best for | TVs, consoles, 4K/120 | High-refresh monitors, ultrawide |
| VRR support | Yes | Yes |
| Common on | All modern GPUs/TVs | Newer GPUs/monitors |
Which output to use
If you game on a living-room TV or a 4K/120 monitor, HDMI 2.1 is ideal and universally supported — it is also the only option for consoles. If you run a high-refresh PC monitor (1440p/360 Hz, 4K/240, or an ultrawide), DisplayPort is the traditional choice and DP 2.1 gives the most headroom. When your monitor and GPU both offer DP 2.1, prefer it for the highest refresh work.
Check both ends and the cable
A DP 2.1 GPU paired with a DP 1.4 monitor communicates at DP 1.4. Likewise, a cheap or overly long cable can fail to sustain full bandwidth, causing black screens or dropped refresh rates. Use a certified cable rated for your target — Ultra High Speed for HDMI 2.1, DP80 for UHBR20.
Do not forget consoles and multi-monitor
Your use case can settle the debate. If the same display doubles as a screen for a PlayStation or Xbox, HDMI 2.1 is mandatory, because consoles have no DisplayPort output. If you run a multi-monitor setup, DisplayPort’s daisy-chaining (MST) and the sheer number of DP outputs on most GPUs make it the practical backbone, with HDMI reserved for a TV or capture device. Count your outputs before buying: a GPU may have three DisplayPort and one HDMI, so plan which device lands on which port to reach every screen’s full refresh rate.
FAQ
Does HDMI 2.1 or DisplayPort give more FPS?
Neither adds frames — the GPU renders them. The output only sets the maximum resolution and refresh it can display. Choose the one that supports your monitor’s full mode.
Can one cable do 4K at 240Hz?
Yes. DisplayPort 2.1 handles it directly, and HDMI 2.1 does it using DSC. Both look identical to the eye; make sure your cable is certified for the bandwidth.
Bottom line
For 4K/120 gaming and TVs, HDMI 2.1 is the practical pick and works everywhere. For the highest-refresh monitors and ultrawides, DisplayPort 2.1 offers more headroom. Match the output to your display’s top mode, confirm both the GPU and monitor support the same version, and use a certified cable so you actually get the refresh rate you bought.
