What Cable for 4K 144Hz?
4K at 144Hz needs enough port bandwidth to carry it: DisplayPort 1.4 can do it using DSC (Display Stream Compression, visually lossless), DisplayPort 2.1 can do it natively at higher UHBR tiers, and HDMI 2.1 (48Gbps) can also carry it — but the specific port and cable both need to match the required bandwidth, not just the headline spec name.
Bandwidth by port version
| Port/Version | Max Bandwidth | What It Carries |
|---|---|---|
| DisplayPort 1.4 | 32.4 Gbps | 4K up to 120Hz+ with DSC; 4K/60Hz uncompressed |
| DisplayPort 2.1 | Up to 80 Gbps (UHBR20) | 4K at 240Hz+ or higher combinations without relying on DSC, depending on UHBR tier implemented |
| HDMI 2.1 | 48 Gbps | 4K at 120Hz with VRR; check specific port wiring |
DSC makes DisplayPort 1.4 viable for 4K/144Hz
DisplayPort 1.4's raw 32.4 Gbps isn't enough for uncompressed 4K at 144Hz, but VESA's Display Stream Compression (DSC) — a visually lossless compression scheme per the spec, not ordinary lossy video compression — closes that gap. Most GPUs and monitors capable of 4K/144Hz over DisplayPort 1.4 are relying on DSC, and it is a legitimate, standard way to reach that combination, not a workaround to be suspicious of.
The "not every port is fully wired" catch
A device labeled with "HDMI 2.1" or "DisplayPort 2.1" support in its marketing does not guarantee every port on that device carries the full bandwidth of that spec — many GPUs and monitors wire full bandwidth to only one or two specific ports. Always check the specific port's rated bandwidth in the manual or spec sheet, not just the headline feature list.
The cable has to match too
A capable port still needs a cable rated for the same bandwidth: an "Ultra High Speed HDMI" certified cable for full 48Gbps HDMI 2.1, or a DP80-certified cable for DisplayPort 2.1's UHBR20 tier. An older or budget/uncertified cable can bottleneck bandwidth even when both the GPU and monitor ports are fully capable.
Full normalized table: The Monitor Numbers.
Frequently Asked Questions
DisplayPort 1.4 can carry 4K at 144Hz using DSC (Display Stream Compression), or DisplayPort 2.1 can carry it without relying on DSC if both your GPU and monitor support the required UHBR bandwidth tier. HDMI 2.1 (48Gbps) can also carry 4K/144Hz but check that the specific port is wired for full bandwidth.
DSC (Display Stream Compression) is visually lossless per the VESA specification in the vast majority of real-world use — it is not the same as ordinary lossy video compression, and most users cannot perceive a difference. It's a legitimate way to reach 4K/144Hz+ over DisplayPort 1.4's raw bandwidth limit.
Not necessarily. Some devices label a port 'HDMI 2.1' while only wiring full 48Gbps bandwidth to one or two of the ports on the device — always check the specific port's bandwidth spec in the manual, not just the headline 'HDMI 2.1' feature listed for the product.
Yes. A DisplayPort or HDMI port capable of a given bandwidth still needs a cable rated for that same bandwidth (e.g., a genuine 'Ultra High Speed HDMI' cable for full 48Gbps HDMI 2.1, or a DP80 certified cable for DisplayPort 2.1 UHBR20) — an older or budget cable can bottleneck an otherwise capable port.