HDMI 2.0 vs 2.1 Bandwidth Difference
HDMI 2.1 has far more bandwidth than HDMI 2.0, enabling modern 4K high-refresh and 8K modes.
Updated February 14, 2026
At a Glance
Start here if you only need the short answer.
- 1HDMI 2.0 maxes at 18 Gbps; HDMI 2.1 reaches 48 Gbps.
- 2That jump enables 4K 120Hz+, higher refresh ceilings, and better future headroom.
- 3If you game at 4K high refresh, HDMI 2.1 is usually the right target.
HDMI 2.0 vs HDMI 2.1 at a Glance
Each target below shows whether this setup can deliver it reliably.
| Target | Result | Notes |
|---|---|---|
| Max bandwidth | 2.0: 18 / 2.1: 48 | Gbps raw signaling level |
| 4K 60Hz | Both | Common on modern displays |
| 4K 120Hz | 2.0: No / 2.1: Yes | Core HDMI 2.1 use case |
| 8K support | 2.0: No / 2.1: Yes | Hardware dependent |
Why 48 Gbps Changes Everything
Bandwidth dictates which resolution, refresh, color depth, and chroma combinations are possible on a single link.
1080p 144Hz
Fits within HDMI 2.0
4K 60Hz
Near HDMI 2.0 ceiling
4K 120Hz
Typically HDMI 2.1 class
4K 144Hz / 8K modes
HDMI 2.1 bandwidth territory
HDMI 2.0 remains fine for mainstream use, but HDMI 2.1 is the practical standard for premium gaming and next-gen display targets.
The entire signal chain still must support HDMI 2.1 to realize those benefits.
Common HDMI Version Misreads
If something is not working, these are the highest-impact checks.
- 1
Cable upgrade assumed to unlock higher modes
A newer cable cannot bypass older port hardware limits.
- Confirm HDMI version on source and monitor
- Then choose appropriate certified cable
- 2
Using non-2.1 input on a 2.1 monitor
Some displays expose different capabilities per input.
- Use the input labeled HDMI 2.1
- Enable high-bandwidth mode in OSD
- 3
Firmware/driver lag
High-end modes may be unstable on outdated software.
- Update monitor firmware if available
- Install latest GPU driver
- 4
Incorrect output color settings
Some color modes can consume extra link budget and reduce refresh options.
- Start with default RGB settings
- Tune color depth/chroma after refresh target is stable
Feature Comparison
Use this side-by-side view when deciding between the two options.
| Feature | HDMI 2.0 | HDMI 2.1 |
|---|---|---|
| Raw bandwidth | 18 Gbps | 48 Gbps |
| 4K high refresh | Limited | Strong |
| 8K readiness | No | Yes |
| Long-term headroom | Lower | Higher |
Decision Guide
Use this quick split to decide if this setup is enough or if you should move to a stronger option.
Great Fit If...
- 4K 60Hz productivity and media
- 1080p/1440p high refresh use cases
- Existing HDMI 2.0 monitor workflows
Consider Another Option If...
- 4K 120Hz+ gaming
- Higher-end console/TV workflows
- Future-facing display upgrades
Common Questions
Fast answers to the questions people ask most before buying.
Is HDMI 2.1 required for 4K 120Hz?
In most practical setups, yes. 4K 120Hz generally needs HDMI 2.1-level bandwidth.
Why is my 144Hz monitor stuck at 60Hz?
Most 60Hz locks come from using the wrong port/cable combination, limited monitor OSD settings, or refresh rate settings left at 60Hz in the OS/GPU panel.
Do I need a new cable when moving to HDMI 2.1?
Use a certified Ultra High Speed HDMI cable to reliably target HDMI 2.1 performance.