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Use the highest-bandwidth input on the monitor and output on the GPU that explicitly support 2560×1440 at 300Hz. HDMI 2.1 can carry an uncompressed 8-bit 1440p/300Hz signal in principle when paired with a certified Ultra High Speed HDMI Cable. DisplayPort 1.4 usually needs Display Stream Compression (DSC) at this mode. DisplayPort 2.1 with UHBR10 or UHBR20 and a VESA-certified DP40 or DP80 cable provides more headroom. A cable cannot add a refresh rate that the monitor input or graphics output does not expose.
Quick answer: choose the link, not the cable label
For a 300Hz 1440p monitor, inspect both ends of the connection:
- HDMI 2.1 on the monitor and GPU: use an official Ultra High Speed HDMI Cable. The link has enough theoretical bandwidth for an 8-bit, uncompressed 2560×1440/300Hz signal, subject to the exact timing and device firmware.
- DisplayPort 2.1 with UHBR: use a VESA-certified DP40 or DP80 cable. This is the most generous DisplayPort option for future HDR, 10-bit and high-refresh modes.
- DisplayPort 1.4: verify that both the monitor and GPU support DSC at 300Hz. Without DSC, you may have to select a lower refresh rate, lower color depth or another reduced mode.
Start with the monitor manual, not a generic cable description. A monitor may advertise 300Hz only through one input, or only with DSC enabled. Likewise, a GPU can have several physical connectors whose capabilities differ by model.
How much bandwidth does 1440p at 300Hz require?
Bandwidth rises with resolution, refresh rate and color depth. Intel describes these as the three elements that determine display data flow. Its 2025 table lists 2560×1440 at 144Hz and 8-bit color at 14.08Gbps. Scaling that figure from 144Hz to 300Hz gives approximately 29.3Gbps for the same 8-bit timing:
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14.08Gbps × (300 ÷ 144) ≈ 29.3Gbps
That is an estimate, not a guaranteed link requirement. Blanking intervals, the monitor’s timing, HDR, 10-bit color, chroma format and link encoding can change the exact payload. It is useful for comparing interfaces, but the monitor’s published mode table remains authoritative.
| Interface or mode | Effective bandwidth stated in the cited specification | What it means for 1440p/300Hz |
|---|---|---|
| 2560×1440, 144Hz, 8-bit | 14.08Gbps (Intel, 2025) | Reference figure used to estimate the 300Hz payload |
| HDMI 2.1 | 42.67Gbps effective link bandwidth (Intel, 2025) | Substantial headroom for the estimated 8-bit signal; exact support still depends on the device ports |
| DisplayPort 1.3/1.4 | 25.92Gbps effective link bandwidth (Intel, 2025) | Usually below an uncompressed 1440p/300Hz 8-bit payload; DSC is commonly required |
| DisplayPort 2.0 | 77.37Gbps effective link bandwidth (Intel, 2025) | Ample transport capacity when the product implements the relevant DP 2.1 UHBR mode |
The 29.3Gbps estimate is why HDMI 2.1 can work without compression in principle, while ordinary DP 1.4 commonly cannot. It does not prove that every HDMI 2.1 monitor or every DP 1.4 monitor exposes 300Hz; implementation, firmware and per-input limits decide that.
HDMI 2.1 for 1440p 300Hz
When HDMI 2.1 is the straightforward choice
Use HDMI when the display’s manual lists 2560×1440 at 300Hz on its HDMI 2.1 input and the GPU has an HDMI 2.1 output. The HDMI 2.1 link’s 42.67Gbps effective bandwidth exceeds the estimated 8-bit payload, leaving room for the transport overhead inherent in the real timing.
For the cable, look for the official name Ultra High Speed HDMI Cable and its certification label. HDMI Licensing specifies this cable category for systems supporting up to 48Gbps. A product page that merely says “HDMI 2.1” is not, by itself, proof that the cable passed that certification.
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HDMI limitations to check
- The monitor may reserve 300Hz for DisplayPort and expose a lower HDMI limit, even when the connector is physically HDMI 2.1.
- HDR or 10-bit output can require a different timing or reduce the maximum refresh rate. Check the manual’s mode table rather than assuming the 8-bit result applies unchanged.
- Cable length is not governed by one universal maximum. HDMI Licensing says the reliable length depends on cable type and construction. Longer runs are more sensitive to signal loss, bends and poor construction.
- Newer HDMI 2.2 documentation describes an Ultra96 cable for systems up to 96Gbps. That is a newer cable designation and does not turn an HDMI 2.0 port into HDMI 2.1 or raise a monitor’s specified refresh limit.
DisplayPort 1.4 and DSC
Why an uncompressed DP 1.4 link is usually short
DisplayPort 1.4’s 25.92Gbps effective bandwidth is below the roughly 29.3Gbps estimate for 1440p/300Hz at 8-bit. The result is often a 300Hz option that appears only when DSC is enabled, or a mode that drops to a lower refresh rate, color depth or chroma format.
What DSC changes
DSC compresses the display stream before transport and reconstructs it in the display. VESA states that DSC bitstream support can reduce DisplayPort transport bandwidth by more than 67 percent without visual artifacts. That reduction is why a DP 1.4 connection can carry modes that would not fit as an uncompressed stream.
DSC must be supported by the GPU, the monitor input and the monitor’s firmware. A DP 1.4 cable cannot enable DSC if either device lacks it. Some displays expose a monitor-menu switch for DSC; others enable it automatically when a supported mode is selected.
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- Confirm 300Hz, HDR and 10-bit combinations separately. A monitor may support 300Hz in SDR 8-bit but reduce refresh when HDR or 10-bit is selected.
- Use a direct DisplayPort connection where possible. Docks, passive adapters and inexpensive converters can remove DSC support or limit the advertised mode.
- If 300Hz is missing, test 240Hz or 280Hz first, then check whether the monitor’s DSC setting and the GPU driver are current.
DisplayPort 2.1 UHBR, DP40 and DP80
DisplayPort 2.1 products can use UHBR (Ultra-high Bit Rate) signaling. VESA defines certified cable classes as follows:
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| VESA cable class | Lane configuration and headline rate | Best use |
|---|---|---|
| DP40 | Four-lane UHBR10, up to 40Gbps | High-refresh 1440p and other UHBR displays when the devices support UHBR10 |
| DP80 | Four-lane UHBR20, up to 80Gbps | Maximum certified headroom among the classes described by VESA; useful for demanding HDR, 10-bit and higher-resolution combinations |
VESA says certified DP40 and DP80 cables guarantee connectivity and operation at the highest performance levels for products supporting DisplayPort 2.1. Certification matters because the connector shape alone does not reveal the signaling rate.
Do not buy a DP80 cable expecting it to upgrade a DP 1.4 output. The source, monitor input and cable must all support the same UHBR capability. A DP 2.1 monitor connected to a DP 1.4 GPU will negotiate the older link’s limits.
DisplayPort vs HDMI at a glance
| Decision factor | HDMI 2.1 | DisplayPort 1.4 | DisplayPort 2.1 UHBR |
|---|---|---|---|
| Effective bandwidth cited by Intel | 42.67Gbps | 25.92Gbps | DP 2.0 table value: 77.37Gbps |
| Uncompressed 8-bit 1440p/300Hz | Enough in principle, based on the estimated 29.3Gbps payload | Usually not enough | Ample when the product implements the relevant UHBR mode |
| DSC at 300Hz | Not inherently required for the estimated 8-bit case | Commonly required | May be unnecessary for 1440p, but device mode tables decide |
| Recommended cable designation | Official Ultra High Speed HDMI Cable, certified for up to 48Gbps | A quality cable rated for the device’s DP 1.4 link; verify the mode and DSC support | VESA-certified DP40 or DP80 |
| Connector choices | Standard HDMI connectors on source and display | Full-size DP, Mini DisplayPort or USB-C with DP Alt Mode, depending on the product | Full-size DP or USB-C implementations, depending on the product |
| Main uncertainty | Per-input refresh limit, HDR/10-bit behavior and cable construction | DSC implementation and reduced-mode behavior | Whether both devices actually expose UHBR, not just the DP 2.1 label |
How to select the correct port and cable
- Read the monitor’s input specification. Find the table that maps each input to resolution, refresh rate, HDR and color depth. Record which input, if any, lists 2560×1440 at 300Hz.
- Identify the GPU output. Check the exact GPU model’s specifications, not just the connector count. Confirm whether its HDMI output is 2.1, its DisplayPort output is 1.4 or 2.1, and whether DSC or UHBR is supported.
- Choose the highest common capability. If both ends have HDMI 2.1, use HDMI with an official Ultra High Speed HDMI Cable. If both have DP 2.1 UHBR, use a certified DP40 or DP80 cable. If DP 1.4 is the common denominator, verify DSC.
- Match the connector. Full-size DP, Mini DisplayPort and USB-C with DP Alt Mode are different physical interfaces. Use the connector specified for the source and display, or a converter explicitly rated for the required mode. A passive shape adapter does not guarantee 300Hz.
- Connect directly for the first test. Bypass docks, KVM switches, extension cables and adapters until 300Hz works. Add each device afterward and retest.
- Select the mode in the operating system and GPU software. In the display settings, choose 2560×1440 and 300Hz. If the option is absent, check the monitor’s input selection and OSD features, then verify the GPU driver and DSC setting.
- Validate the final color mode. Confirm whether the selected mode is 8-bit or 10-bit, SDR or HDR, and RGB or a reduced chroma format. A nominal 300Hz setting may be a different mode from the one you intended.
What to buy in common situations
Both monitor and GPU have HDMI 2.1
Buy an official Ultra High Speed HDMI Cable with the certification label. Select the monitor’s HDMI 2.1 input and then choose 2560×1440 at 300Hz. If the mode is unavailable, the product’s per-input specification or firmware—not the cable’s marketing name—is the next thing to investigate.
Both have DisplayPort 2.1 UHBR
Use a VESA-certified DP40 cable for UHBR10 or DP80 for UHBR20, matching the capability listed for both devices. DP80 offers the greatest stated headroom, but a higher-rated cable cannot overcome a lower-rated port.
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The GPU is DP 1.4 and the monitor is DP 1.4
Confirm DSC support on both sides and enable it if the monitor provides a setting. Expect 300Hz to depend on the monitor’s exact timing and color options. If the manual lists 300Hz only with DSC, an ordinary uncompressed DP 1.4 configuration will not deliver it.
The monitor has HDMI 2.1 but the laptop has USB-C
Determine whether the USB-C port carries DisplayPort Alt Mode and which DP generation it implements. Use a properly rated USB-C-to-DisplayPort cable if the monitor’s DP input supports the desired mode, or a USB-C-to-HDMI solution that explicitly supports the needed HDMI 2.1 features. USB-C describes the connector, not the video bandwidth.
You need a long cable run
Prefer a certified cable appropriate to the link and keep the run as short as practical. HDMI Licensing notes that reliable HDMI length depends on cable type and construction rather than one universal limit. For DP40 or DP80, follow the cable maker’s certified length and active/passive designation. If a long run is unstable, reduce length, remove extensions and test at a lower refresh rate to isolate signal margin.
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Why 300Hz may not appear after you connect the cable
The monitor input is the limiting factor
Many monitors expose different maximum refresh rates on different inputs. Recheck the manual and the monitor OSD input information. Moving the cable to the input listed for 300Hz can resolve the issue without changing hardware.
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The GPU output is not the advertised generation
A graphics card can include HDMI and DisplayPort connectors with different capabilities. Verify the exact model and connector specification. A DP 1.4 output connected to a DP 2.1 display still operates at DP 1.4 limits.
DSC is disabled or unsupported
On DP 1.4, inspect the monitor’s DSC option and confirm GPU support. If DSC is unavailable, try the monitor’s documented lower-refresh mode. Do not assume that installing a DP80 cable will fix a missing DSC implementation.
HDR or 10-bit changes the mode
First test 300Hz in the monitor’s documented SDR 8-bit mode. Then enable HDR or 10-bit and check the resulting refresh rate and color format. If the combination disappears, that is a mode-bandwidth or firmware limit, not necessarily a defective cable.
An adapter, dock or KVM is in the path
Connect the GPU directly to the monitor. If 300Hz works, add the dock, switch or adapter back one component at a time. The intermediary must support the same resolution, refresh rate, color depth and DSC or UHBR features as the direct link.
The cable is uncertified or damaged
Replace an unverified “HDMI 2.1” cable with a certified Ultra High Speed HDMI Cable, or replace an unverified UHBR cable with a VESA-certified DP40 or DP80 model. Inspect connectors for looseness and avoid sharp bends. Intermittent black screens, sparkles or brief signal drops indicate a link-integrity problem even when the mode is selectable.
Frequently overlooked details
- 300Hz is a transport mode, not a guarantee of panel behavior. The monitor’s panel, overdrive settings and response characteristics determine how motion appears; the cable only transports the signal.
- Color depth changes the calculation. The approximately 29.3Gbps estimate is for the scaled 8-bit reference. HDR and 10-bit operation can require more bandwidth or a different timing.
- Compression is not automatically visible. VESA describes DSC as reducing transport bandwidth by more than 67 percent without visual artifacts when properly implemented. The practical question is whether both devices support it at the chosen mode.
- Connector shape is not a specification. Mini DisplayPort and USB-C can carry DisplayPort, but their capabilities depend on the source implementation and cable.
- New cable branding does not upgrade old hardware. Ultra High Speed HDMI and DP80 identify cable capabilities; they do not change the maximum signal supported by the monitor or GPU.
Bottom line
Choose HDMI 2.1 plus a certified Ultra High Speed HDMI Cable when both the monitor input and GPU output list 1440p at 300Hz over HDMI. Choose DisplayPort 2.1 UHBR with a VESA-certified DP40 or DP80 cable when both ends support it and you want the most bandwidth headroom. Use DisplayPort 1.4 only after confirming DSC support on both devices. Before buying anything, verify the exact monitor input, GPU output, HDR/10-bit behavior and connector type; those specifications, rather than the cable alone, determine whether 300Hz is available.
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