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For 2560×1440 at 300Hz, use the input and output that explicitly advertise that mode. HDMI 2.1 can carry an uncompressed 8-bit signal at this resolution and refresh rate in principle when paired with an official Ultra High Speed HDMI Cable. DisplayPort 1.4 usually needs Display Stream Compression (DSC) to reach 300Hz, while DisplayPort 2.1 UHBR with a VESA-certified DP40 or DP80 cable provides considerably more bandwidth headroom. A cable cannot add a refresh mode that the monitor input or graphics-output port does not support.
Quick answer: choose the port before you choose the cable
The monitor’s input specification and the graphics processor’s output specification are the deciding factors. Check both manuals or specification pages for an explicit entry such as “2560×1440 at 300Hz.” Do not infer support from the connector’s shape or from a cable package that merely says “high speed.”
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| Available connection | Recommended cable | What to expect at 1440p/300Hz |
|---|---|---|
| DisplayPort 2.1 UHBR on both devices | VESA-certified DP40 or DP80, with the correct connector at each end | Ample link headroom; normally the strongest choice for high-refresh, 10-bit or HDR configurations, subject to the monitor’s mode table |
| HDMI 2.1 on both devices | Official Ultra High Speed HDMI Cable carrying the certification label | Enough theoretical bandwidth for an uncompressed 8-bit signal; monitor firmware and GPU output still determine whether 300Hz is exposed |
| DisplayPort 1.4 on one or both devices | A properly rated DisplayPort cable; verify DSC support on both ends | Uncompressed 300Hz is generally beyond the link’s effective bandwidth, so DSC, reduced color depth, chroma subsampling or a lower refresh rate may be required |
| Mixed generations or an adapter/dock | A converter specifically rated for the target mode, if one exists | The lowest-capability port, adapter, dock, cable or firmware setting becomes the limit; many adapters do not expose 300Hz |
If the monitor has both inputs, use the one whose manual lists 300Hz with your desired color depth and HDR setting. Then select the matching output on the GPU. Connecting a premium cable to an input that is limited to 240Hz will not unlock 300Hz.
How much bandwidth 1440p at 300Hz needs
Display bandwidth rises with pixel count, refresh rate and bits per pixel. Intel describes those three factors as the basis of monitor bandwidth calculations. Its 2025 table lists 2560×1440 at 144Hz and 8-bit color as requiring 14.08Gbps, and lists effective link bandwidths of 42.67Gbps for HDMI 2.1, 25.92Gbps for DisplayPort 1.3/1.4 and 77.37Gbps for DisplayPort 2.0.
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The 300Hz estimate
Scaling Intel’s 14.08Gbps 144Hz figure to 300Hz gives approximately 29.3Gbps for the same 8-bit timing. That is an inference rather than a monitor-specific measurement: blanking intervals, exact timings, chroma format, HDR signaling and link encoding alter the final requirement. It nevertheless explains the practical split. HDMI 2.1’s effective capacity leaves theoretical room for this 8-bit payload, whereas DisplayPort 1.4’s effective capacity is lower than the estimate.
Why 10-bit and HDR can change the result
Moving from 8-bit to 10-bit increases pixel data, and HDR may require a different timing or color format. A monitor can therefore advertise 300Hz for 8-bit SDR while offering only 240Hz, DSC-assisted 300Hz, or a different chroma mode for 10-bit HDR. The only authoritative answer is the monitor’s per-input table, not a generic bandwidth calculator.
Uncompressed transport versus DSC
DSC compresses the DisplayPort stream before transport. VESA states that DSC bitstream support can reduce DisplayPort transport bandwidth by more than 67 percent without visual artifacts. That reduction is why a DisplayPort 1.4 system can often deliver a 300Hz 1440p mode even though its uncompressed effective link bandwidth is lower than the estimated payload. Both the source and display must implement DSC, and the operating-system or GPU control panel must expose the compressed mode.
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HDMI 2.1: when it is the right choice
HDMI Licensing identifies the official Ultra High Speed HDMI Cable for systems supporting up to 48Gbps maximum bandwidth. Look for that exact cable name and its certification label. An unverified package claim such as “HDMI 2.1 cable” does not prove that the cable passed the official performance test.
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What HDMI 2.1 can and cannot guarantee
The 42.67Gbps effective figure in Intel’s table gives HDMI 2.1 theoretical room for the estimated 8-bit 1440p/300Hz payload. It does not guarantee that every HDMI 2.1 monitor input offers 300Hz. Manufacturers can limit an input to a lower refresh rate, reserve 300Hz for DisplayPort, or require a particular firmware version. Graphics outputs can likewise expose different modes depending on the device model and driver.
Setting up an HDMI connection
- Read the monitor manual’s HDMI section and confirm a line for 2560×1440 at 300Hz. Note whether that line is limited to 8-bit, SDR, or a particular chroma format.
- Confirm that the graphics output is labeled HDMI 2.1 and that its specifications list the required mode.
- Connect an official Ultra High Speed HDMI Cable directly between the GPU and monitor. Avoid passing through a receiver, switch, dock or capture device while diagnosing the link.
- Open the operating system’s advanced display settings or the GPU control panel, select 2560×1440 and 300Hz, then apply the setting.
- Check the active signal information in the monitor’s on-screen display. Verify the refresh rate, bits per color and HDR status rather than relying only on the desktop resolution.
If 300Hz appears only at 8-bit, that may be the documented limit for the HDMI input. If the manual promises 10-bit 300Hz but the option is missing, test the supplied or certified cable, update monitor and graphics drivers where the manufacturer provides updates, and remove intermediate devices.
DisplayPort 1.4: why DSC is usually part of the plan
DisplayPort 1.4 has 25.92Gbps of effective link bandwidth in Intel’s table. That is typically insufficient for an uncompressed 2560×1440 300Hz 8-bit signal based on the 29.3Gbps estimate, before adding the demands of 10-bit color or HDR. Consequently, a DisplayPort 1.4 monitor/GPU pair commonly relies on DSC for 300Hz.
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Find “DSC” or “Display Stream Compression” in the monitor’s DisplayPort specification and in the graphics-output specification. Some products support DSC on one input but not another, or enable it only at certain resolutions. If either endpoint lacks DSC, select the highest mode the uncompressed link offers; the choices may include 240Hz, 8-bit color, or reduced chroma.
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Recognizing a DSC-related limitation
- The display settings stop at 240Hz even though the monitor is marketed as a 300Hz model.
- 300Hz is selectable only after switching from 10-bit to 8-bit color.
- HDR disappears when 300Hz is selected.
- The monitor’s information panel reports a lower color depth than expected.
These symptoms do not automatically indicate a defective cable. They can mean that DSC is disabled, unavailable on that input, or not negotiated by the driver. Confirm the documented combinations first, then test a direct connection with a known-good cable.
DisplayPort 2.1 UHBR: the most headroom
VESA defines DP40 cables for four-lane UHBR10 operation up to 40Gbps and DP80 cables for four-lane UHBR20 operation up to 80Gbps. VESA says certified DP40 and DP80 cables guarantee connectivity and operation at the highest performance levels for products supporting DisplayPort 2.1. DP80 is the higher-headroom certification; use it when both devices support UHBR20 and the cable length and construction are appropriate.
Match the cable to the actual ports
A DisplayPort 2.1 label on a cable is not enough by itself. Confirm whether the source and monitor support UHBR10, UHBR13.5 or UHBR20, then choose a cable with the corresponding DP40 or DP80 certification. A lower-rated cable may still function, but it can force a lower link rate or produce intermittent errors at high data rates.
Connector forms
DisplayPort may appear as full-size DisplayPort, Mini DisplayPort or USB-C carrying DisplayPort Alt Mode. The connector shape does not reveal the supported UHBR rate. For USB-C, verify that the specific port—not merely the computer model—supports the required DisplayPort Alt Mode bandwidth. Use a certified converter only when its specification explicitly includes 2560×1440 at 300Hz; passive plugs and generic USB-C hubs often cap refresh rate.
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Comparison by the factors that affect a real setup
| Factor | HDMI 2.1 | DisplayPort 1.4 | DisplayPort 2.1 UHBR |
|---|---|---|---|
| Effective bandwidth cited by Intel | 42.67Gbps | 25.92Gbps | Intel’s table lists DisplayPort 2.0 at 77.37Gbps; UHBR capability depends on the specific DP 2.1 implementation |
| Uncompressed 8-bit 1440p/300Hz | Enough in principle based on the estimated 29.3Gbps payload | Usually short of the estimate | Substantial headroom |
| DSC at 300Hz | Not normally needed for the basic 8-bit estimate, but monitor modes vary | Commonly required | May be unnecessary for 8-bit and still useful for higher color depth or HDR combinations |
| Certification to look for | Official Ultra High Speed HDMI Cable label | A cable rated for the required DisplayPort mode; verify DSC support | VESA-certified DP40 or DP80 |
| Connector considerations | Standard HDMI connector; adapters can change the maximum mode | Full-size DP, Mini DP or USB-C DP Alt Mode | Same connector variants, with UHBR support tied to the device and cable |
How to choose when a monitor offers both inputs
Choose DisplayPort 2.1 first when both devices support UHBR
A certified DP40 or DP80 cable gives the link the most transport headroom among the documented options. This is particularly useful if you want 10-bit color, HDR and 300Hz simultaneously, although the monitor’s own mode table remains decisive.
Choose HDMI 2.1 when it is the only port documented for 300Hz
Use the HDMI input that explicitly lists the target mode and pair it with the official Ultra High Speed cable. Do not switch to DisplayPort merely because the connector is commonly associated with PC monitors; a DisplayPort 1.4 input may require DSC or expose a lower refresh rate.
Use DisplayPort 1.4 only after confirming the complete mode combination
If the manual lists 300Hz with DSC, DP 1.4 is a valid solution. If it lists 300Hz only at 8-bit, decide whether that is acceptable before buying the cable. If no 300Hz entry exists, no cable can create one.
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Installation checklist
- Record the target signal. Write down 2560×1440, 300Hz, desired bits per color, HDR on or off, and whether you require full RGB rather than chroma subsampling.
- Check the monitor input table. Identify which physical input supports that exact combination. Pay attention to footnotes for DSC, HDR and firmware.
- Check the GPU output. Verify the connector type and maximum mode for the specific output you will use.
- Select the certified cable. Use Ultra High Speed HDMI for HDMI 2.1, or VESA DP40/DP80 for DP 2.1 UHBR. For DP 1.4, confirm a cable suitable for the required rate and DSC mode.
- Connect directly. Remove docks, switches, extension couplers and adapters during the first test. Seat both connectors fully.
- Apply the mode. In advanced display settings, select 2560×1440 and 300Hz. In the GPU control panel, choose the PC resolution category when it is presented separately from television timings.
- Validate the signal. Read the monitor’s information screen for refresh rate, color depth, RGB or chroma format and HDR state.
- Stress the connection. Run the applications you normally use. Watch for black screens, sparkles, intermittent dropouts or driver resets before routing the cable permanently.
Troubleshooting a missing or unstable 300Hz mode
The display is capped at 144Hz or 240Hz
- Recheck the monitor’s input-specific specification; the advertised 300Hz may apply only to one connector.
- Make sure the operating system is using the monitor’s PC timing at 2560×1440, not a television timing with a different refresh list.
- Confirm that the graphics output is the high-bandwidth port and that the driver recognizes the monitor correctly.
- For DP 1.4, verify DSC on both endpoints. Without it, select a lower refresh rate or color depth.
- Test a direct certified cable and bypass every adapter or dock.
300Hz works, but HDR or 10-bit disappears
The combination may exceed the available link bandwidth or be disabled by the monitor firmware. Check the manual for separate 8-bit and 10-bit tables. On DP 1.4, DSC may be required for the higher-color-depth mode; on HDMI 2.1, the monitor may still impose its own limit despite the link’s theoretical capacity.
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The screen flickers, blanks or shows sparkles
High-rate links are sensitive to cable construction, length, connector seating and intermediate hardware. Power the monitor off, reseat both ends, remove extensions, and test the shortest certified cable you can use. If the problem changes with length, treat that as a signal-integrity issue rather than a resolution-setting problem.
An adapter or USB-C hub is involved
Read the adapter’s complete specification, including refresh rate, color depth and whether it is active or passive. USB-C DP Alt Mode can be limited by the number of lanes shared with USB data. A hub that works at 1440p/144Hz may not pass 300Hz even though the computer’s native port can.
Cable length and reliability
HDMI Licensing does not publish one universal maximum length for every Ultra High Speed HDMI Cable; length depends on cable type and construction. The same principle applies to high-rate DisplayPort links. Choose a certified cable from a reputable manufacturer, keep it as short as your installation allows, avoid sharp bends at the connectors, and do not assume an active or optical design is automatically compatible with every UHBR rate. If a long run is unavoidable, verify that the exact cable certification and advertised length cover the target mode.
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- A monitor input whose firmware limits 300Hz to another connector.
- A graphics output that lacks the required HDMI, DisplayPort or UHBR capability.
- A missing DSC implementation when the uncompressed link is short of the payload.
- An adapter, switch, dock or capture device with a lower bandwidth ceiling.
- Unsupported 10-bit, HDR or chroma combinations listed nowhere in the monitor’s specifications.
The safest buying method is therefore to start with the monitor’s exact mode table, match the GPU output, and only then purchase the cable certification that corresponds to that link.
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