USB-C to DisplayPort Cables and Adapters: 40Gbps, 54Gbps, 80Gbps and DP 1.4 Compared
A USB-C to DisplayPort connection can turn a compatible laptop, tablet, or desktop into a high-resolution workstation. Choosing the right cable or adapter takes more than matching the connectors: signal direction, DisplayPort bandwidth, display capabilities, and power requirements all matter.
This guide compares four GenixLinks options: a 54Gbps one-way cable, a 40Gbps two-way cable, an 80Gbps one-way adapter, and a DisplayPort 1.4 adapter. Start with the ports on your computer and monitor, then choose the design and performance level that fit the complete setup.
USB-C to DisplayPort Comparison at a Glance
| Product | Design | Video bandwidth | Signal direction | Listed display modes |
|---|---|---|---|---|
| 54Gbps DisplayPort 2.1 Cable | Direct cable; 3 ft or 6 ft | Up to 54Gbps; DP54 / UHBR13.5 | USB-C source → DisplayPort monitor | Up to 8K at 165Hz; 4K at 480Hz or 240Hz |
| 40Gbps Bi-Directional DisplayPort 2.1 Cable | Direct cable; 3 ft, 6 ft, or 10 ft | Up to 40Gbps; DP40 / UHBR10 | USB-C source → DP monitor, or DP source → compatible USB-C display | Up to 8K at 120Hz or 4K at 480Hz; 4K at 120Hz in many setups |
| 80Gbps DisplayPort 2.1 Adapter | Adapter plus a separate DisplayPort cable | Up to 80Gbps | USB-C source → DisplayPort monitor | Up to 16K at 60Hz, 8K at 240Hz, or 4K at 960Hz |
| USB-C to DisplayPort 1.4 Adapter | Adapter plus a separate DisplayPort cable | DisplayPort 1.4; product page does not give a separate Gbps rating | USB-C source → DisplayPort monitor | Up to 8K at 60Hz or 4K at 240Hz; DSC required for the listed maximum modes |
Read the specifications, not just the web address. The fourth product is currently titled USB-C to DisplayPort 1.4 Adapter, model USBC-086-GL. Its URL contains “2-1,” but its current title and specifications identify it as DisplayPort 1.4.
Bandwidth Is a Video Link Rating
The 40Gbps, 54Gbps, and 80Gbps figures describe the advertised DisplayPort video bandwidth of these products. They are not USB file-transfer speeds, charging ratings, or guarantees of usable pixel bandwidth after link overhead. A DisplayPort 2.1 label also does not mean every source and monitor supports the same link rate.
The 40Gbps cable lists UHBR10, while the 54Gbps cable lists UHBR13.5. At the DisplayPort standard level, an 80Gbps four-lane link corresponds to UHBR20. VESA explains the UHBR10 and UHBR20 bandwidth levels. The 80Gbps adapter page advertises the total bandwidth; do not treat that figure alone as proof of a particular certification.
The DisplayPort 1.4 adapter belongs to a different performance class. DisplayPort 1.4 can use HBR3, whose four-lane raw link ceiling is 32.4Gbps, but the product page does not state a separate tested Gbps rating for this adapter. Its most useful published specifications are the supported display modes and the requirement for DSC at the listed maxima.
54Gbps Cable: A Direct Connection to a DisplayPort Monitor
The GenixLinks 54Gbps Unidirectional USB-C to DisplayPort 2.1 Cable (USB4-456-GL) suits a desk where the computer has USB-C video output and the monitor has a DisplayPort input. It provides the complete cable connection without a separate adapter or DisplayPort cable.
Its DP54 / UHBR13.5 specification adds bandwidth above the 40Gbps model. The page lists backward compatibility with DP40, DisplayPort 1.4, and DisplayPort 1.2, along with MST and audio up to 7.1 channels where supported. Lower-capability equipment still sets the performance limit.
This cable works in one direction. It cannot connect a DisplayPort graphics-card output to a USB-C monitor. Choose its 3-foot or 6-foot length to fit the desk, and press the DisplayPort latch release before unplugging.
40Gbps Cable: Video in Either Direction
The GenixLinks 40Gbps Bi-Directional USB-C to DisplayPort 2.1 Cable (USB4-346-GL) supports two arrangements: USB-C video output to a DisplayPort monitor, or a DisplayPort source to a USB-C display that accepts DisplayPort Alt Mode input. “Bi-directional” means either signal direction is supported; it does not mean two simultaneous video streams.
The reverse arrangement needs particular care. A USB-C socket on a display does not automatically accept DP Alt Mode video, and a Thunderbolt-only display should not be assumed compatible. The display must also have its own power source, such as an external supply or separate power-input port.
This model explicitly carries no USB data and no USB-C Power Delivery. It cannot power portable monitors, AR glasses, or VR headsets from a DisplayPort source. Avoid it for a single-port portable monitor that depends on one cable for both video and power.
80Gbps Adapter: More Headroom with a Separate Cable
The GenixLinks 80Gbps Unidirectional USB-C to DisplayPort 2.1 Adapter (USB4-386-GL) is the highest-bandwidth option in this comparison. Its current page advertises the extreme display modes shown in the table, along with a metal housing and plug-and-play operation without additional driver software.
An adapter lets you choose a separate DisplayPort cable to suit the distance and monitor. That cable becomes another part of the performance chain: for an 80Gbps setup, select a cable rated for the required UHBR20 bandwidth, such as an appropriate DP80 cable. A lower-rated cable can limit the connection.
The adapter is one-way, from a USB-C video source to a DisplayPort display. It cannot upgrade a computer’s native DisplayPort output capability. A Thunderbolt 4 or Thunderbolt 5 connector alone does not guarantee the adapter’s maximum video bandwidth or listed refresh rates.
DisplayPort 1.4 Adapter: Match Existing Equipment
The GenixLinks USB-C to DisplayPort 1.4 Adapter (USBC-086-GL) is a compact option for connecting a compatible USB-C source to an existing DisplayPort monitor using a separate cable. The page lists HDR, high-definition audio, and MST for compatible daisy-chain configurations.
Its 8K at 60Hz and 4K at 240Hz specifications rely on compatible equipment and DSC. Do not read a shared “4K at 240Hz” claim as meaning this adapter has the same uncompressed bandwidth as an 80Gbps adapter. It is also a USB-C-to-DisplayPort output adapter; wording elsewhere on the page does not establish reverse-direction support.
DisplayPort Alt Mode and DSC: Check the Whole Setup
USB-C is a connector shape, not a video guarantee. For USB-C-to-DisplayPort operation, the source port must provide DisplayPort Alt Mode video. A charging-only or data-only USB-C port cannot produce a picture through these products. Check the exact computer port, including the DisplayPort version and supported link rate.
Display Stream Compression (DSC) reduces the bandwidth needed to carry a demanding display mode. It must be supported by the relevant source, display, and signal path. The 54Gbps page mentions DP 2.1 output or DP 1.4 HBR3 with DSC for demanding modes, while the 40Gbps page notes that DSC affects available modes. The 80Gbps page does not give a per-mode DSC breakdown, so its listed maxima should not be interpreted as guaranteed uncompressed output.
Resolution, refresh rate, HDR, color depth, chroma format, and display timing all affect bandwidth requirements. The GPU, operating system, port, cable length, monitor input, and firmware must support the selected combination. A cable’s maximum claim does not make every listed mode available on every computer.
MST support also depends on the source, operating system, and connected monitors. A product that supports MST does not guarantee multiple independent desktops on every computer. Check the system’s external-display limits before planning a daisy chain.
These Connections Do Not Replace a Dock
These four products provide a display connection rather than a full USB-C docking connection. Do not expect USB storage, a monitor’s USB hub, webcam, touch interface, or laptop charging to work through the DisplayPort path. None of the four pages lists a laptop Power Delivery pass-through input; the 40Gbps cable expressly rules out USB data and USB-C PD.
Power used internally by an adapter is different from charging power delivered to a laptop or portable monitor. Keep a separate charger for the computer and the monitor’s required power connection. Connect USB peripherals through their own USB cable or a suitable hub or dock.
Which GenixLinks Option Should You Choose?
- For a direct USB-C-to-DisplayPort connection with DP54 capability: choose the 54Gbps one-way cable.
- For a DisplayPort source feeding a separately powered USB-C DP Alt Mode display: choose the 40Gbps bi-directional cable.
- For a capable DP 2.1 source and display, with your choice of DisplayPort cable: choose the 80Gbps one-way adapter.
- For compatible DisplayPort 1.4 equipment and DSC-supported high-resolution output: choose the DisplayPort 1.4 adapter.
Before buying, confirm the signal direction, USB-C video support, monitor input, target display mode, and power arrangement. Matching those details will give you a more reliable connection than choosing by the largest bandwidth number alone.