In this guide
Yes, you can get 240Hz through HDMI, but only with HDMI 2.0 or higher, a compatible GPU, a 240Hz monitor, and a certified high-speed cable.
- You have HDMI 2.1 (48Gbps) for 1080p or 1440p at 240Hz uncompressed
- You have HDMI 2.0 for 1080p at 240Hz
- Your GPU and monitor both support the required HDMI version
- You use a certified Ultra High Speed HDMI cable
- You are using HDMI 1.4 (max ~144Hz at 1080p)
- Your monitor or GPU lacks proper HDMI 2.1 implementation
- You use a non-certified or older HDMI cable
- You want uncompressed 4K/240Hz on HDMI 2.1 (requires DSC compression)
Which HDMI Version Do You Need?
Not all HDMI versions carry enough bandwidth for 240Hz. The version in your cable, GPU port, and monitor port all have to match up. The weakest link in the chain sets the limit.
| Setup | Works? | Need | Note |
|---|---|---|---|
| 1080p / 240Hz | Yes | HDMI 2.0+ | Uncompressed, widely supported |
| 1440p / 240Hz | Yes | HDMI 2.1 | Uncompressed at full 48Gbps |
| 4K / 240Hz | Partial | HDMI 2.1 + DSC | Compressed; visually lossless |
| 4K / 240Hz uncompressed | Yes* | HDMI 2.2 (2025+) | Requires Ultra96 cable |
| Any res / 240Hz on HDMI 1.4 | No | Upgrade needed | Max ~144Hz at 1080p |
HDMI 2.1 Is the Sweet Spot for 240Hz Gaming
HDMI 2.1 runs at 48Gbps and handles 1080p and 1440p at 240Hz without any compression. For 4K at 240Hz, it uses Display Stream Compression (DSC), which is visually lossless in most gaming scenarios. Check out the Cable Matters breakdown of HDMI bandwidth and refresh rates for a deeper look at how the numbers stack up.
One important catch: some GPUs and monitors advertise HDMI 2.1 but only implement it at reduced bandwidth (sometimes as low as 32Gbps). Always confirm the full 48Gbps spec before buying.
What Else Affects 240Hz Over HDMI?
- GPU output: Your graphics card must support HDMI 2.1 output at full bandwidth. Check the spec sheet, not just the port label.
- Monitor input: The display needs a true HDMI 2.1 input rated for 240Hz at your target resolution.
- Cable grade: Use an Ultra High Speed HDMI cable (certified for 48Gbps). Standard or High Speed cables will bottleneck the signal.
- Drivers: Outdated GPU drivers can prevent high refresh rate modes from appearing. Keep them updated.
If you are connecting via a USB-C port, the rules change. See how USB-C connects to HDMI to understand the adapter requirements, and check why USB-C to HDMI sometimes fails if you run into problems with that path.
HDMI 2.2: The Future of High-Refresh HDMI
HDMI 2.2, expected to roll out from 2025 onward, doubles the bandwidth to 96Gbps. This means uncompressed 4K at 240Hz becomes possible with a new Ultra96 cable. It is not widely available yet, but it removes the need for DSC at 4K/240Hz entirely.
Bottom line: Getting 240Hz through HDMI is straightforward at 1080p with HDMI 2.0, and fully capable at 1440p with HDMI 2.1. For 4K/240Hz you need HDMI 2.1 with DSC enabled, or wait for HDMI 2.2 hardware. Always verify the HDMI version on both your GPU and monitor, and use a certified Ultra High Speed cable to avoid bandwidth bottlenecks.