In this guide
There is no meaningful input lag difference between HDMI and DisplayPort. Real-world testing shows less than 0.2ms separates the two cables at the same resolution and refresh rate — a gap no human can perceive.
- Using HDMI 2.0+ or DisplayPort 1.2+ cables
- Both cables run at the same resolution and refresh rate
- Using a PC monitor with minimal image processing
- Using passive cables, which add no meaningful latency
- Using older HDMI or DisplayPort standards with larger signal buffers
- Your monitor applies heavy image processing regardless of cable
- You rely on ALLM (Auto Low Latency Mode), which is HDMI-only and mainly benefits consoles, not PC monitors
What the Numbers Actually Show
In one comprehensive high-speed camera test at 960 fps, HDMI 2.0 averaged 94.92ms of input lag and DisplayPort 1.4 averaged 94.73ms. That 0.19ms gap is smaller than a single frame at 60Hz (16.7ms) and completely imperceptible during gaming or general use. The cable protocol itself adds only 0 to 0.5ms of theoretical overhead, measured in microseconds at the transceiver level.
For a deeper technical breakdown of display signal latency, RTINGS explains how input lag is measured and what contributes to it.
What Actually Causes Input Lag
The cable is almost never the culprit. These factors have a far greater effect on perceived latency:
- Monitor response time — pixel transition speed directly affects how sharp fast motion looks
- GPU render time — how long your graphics card takes to produce a frame
- Image processing on the display — features like upscaling, HDR tone mapping, or motion smoothing add real milliseconds
- Refresh rate — running at 144Hz instead of 60Hz cuts maximum frame delivery time from 16.7ms to 6.9ms
HDMI vs DisplayPort: Quick Comparison
| Setup | Works? | Need | Note |
|---|---|---|---|
| HDMI 2.0 to PC monitor | Yes | Standard HDMI cable | No lag penalty vs DisplayPort |
| DisplayPort 1.4 to PC monitor | Yes | DP 1.4 cable | No lag advantage over HDMI |
| HDMI to TV for console gaming | Yes | HDMI 2.1 cable + ALLM-capable TV | ALLM reduces TV processing lag |
| Old HDMI 1.4 at 4K | Limited | Upgrade cable | Bandwidth cap, not latency issue |
When Cable Choice Does Matter
Cable type matters for bandwidth and feature support, not latency. If you need 4K at 144Hz, DisplayPort 1.4 or HDMI 2.1 are required — but that’s a bandwidth limitation, not an input lag difference. If you’re connecting a USB-C device to a display, check out whether USB-C can connect to HDMI before buying an adapter. For console or TV setups where ALLM is relevant, HDMI is the only option since DisplayPort does not support that feature.
If you’re troubleshooting a video connection that isn’t working as expected, our guide on why USB-C to HDMI stops working covers common signal issues that can indirectly affect display performance.
Bottom line: For hdmi vs displayport input lag, use whichever cable your GPU and monitor support best. The sub-0.2ms difference between the two is unmeasurable in practice. Focus on monitor response time, refresh rate, and turning off unnecessary display processing — those changes will make a real difference where cable choice never will.