DisplayPort 2.1 vs HDMI 2.1 | Which One Do You Actually Need?

Both standards get marketed with the same numbers. 8K, 4K at high refresh, HDR, "future-proof." Scroll past the spec sheet and they're not solving the same problem. Picking the wrong one doesn't just waste money on a cable, it caps a GPU, monitor, or console at a resolution and refresh rate it was actually built to exceed.

Here's the actual difference, and how to know which one your setup needs.

The short version

HDMI 2.1 is built for displays and source devices that expect HDMI TVs, consoles, AV receivers, and soundbars. It carries audio return (eARC), CEC control, and is the only option if a TV is involved.

DisplayPort 2.1 (DP80 / UHBR20) is built for GPU-to-monitor connections. It carries more raw bandwidth, supports multi-monitor daisy-chaining (MST), and is the standard your graphics card almost certainly outputs natively if you're not going through a TV.

If a television is anywhere in the chain, the decision's already made = HDMI. If it's a GPU driving a monitor, DisplayPort is usually the better-supported, higher-headroom option.

Where the numbers actually diverge

HDMI 2.1 is certified at 48Gbps, which covers 8K at 60Hz or 4K at 120Hz with the right compression handling. That's genuinely a huge jump over HDMI 2.0's 18Gbps, and it's the number the cable market has spent five years talking about.

DisplayPort 2.1 UHBR20 runs at 80Gbps, more than double HDMI 2.1's ceiling. That extra bandwidth is what makes uncompressed 4K at 240Hz or 8K at 120Hz possible without leaning on Display Stream Compression (DSC) to get there. HDMI 2.1 can hit similarly high numbers on paper, but it's doing more of that work through compression rather than raw bandwidth.

For gaming monitors chasing high refresh rate at high resolution, that headroom is the whole point of upgrading in the first place.

The compatibility trap

Neither standard is fixed by the cable, you're limited by the weakest certified link in the chain. A UHBR20-rated DisplayPort cable plugged into a GPU or monitor that only supports UHBR13.5 won't unlock speeds the hardware itself doesn't have. Likewise, an HDMI 2.1 cable can't make an HDMI 2.0 port behave like 2.1.

Before buying either, it's worth confirming:

• What your source device (GPU, console, PC) is actually certified to output
• What your display is certified to receive
• That both ends agree on the same standard, cables don't average the two

Which one for which setup

Choose HDMI 2.1 if:

• You're connecting to a TV, soundbar, or AV receiver
• You need eARC for audio return or CEC for remote/device control
• You're on console (PS5, Xbox Series X/S)

Choose DisplayPort 2.1 if:

• You're running a GPU directly into a monitor
• You want the highest achievable refresh rate at high resolution, uncompressed
• You're setting up multiple monitors and want MST daisy-chaining from one port

Running both a TV and a monitor? It's common and normal to have both cable types in the same setup, each doing the job it's actually built for.

The part that doesn't show up in either spec sheet

Both standards define what the format can do. Whether your actual cable holds that bandwidth reliably at your actual run length is a separate question. The one most buyers never get an answer to before checking out. That's the gap between a cable that's technically 2.1 or UHBR20 certified and one that visibly holds the full spec at 3 metres versus 0.5.

Every ElectricCrab cable, HDMI or DisplayPort is bench-tested at full bandwidth across every length in the range before it ships, not just the shortest one. If you're not sure which standard your setup needs, get in touch and we'll work it out from your actual hardware, not the box it came in.