Trying to overclock 144hz monitor to 240hz can seem like a free alternative to buying a faster gaming display, but there is an important limitation: a monitor rated for 144Hz is not necessarily capable of running at 240Hz. The graphics card can generate a 240Hz display signal, but the monitor’s panel, internal controller, firmware, and supported input modes determine whether it can display that signal correctly. The safest approach is to check the exact monitor model, use any manufacturer-provided overclocking feature, and verify every supported refresh-rate increase before keeping it.
- Can You Overclock a 144Hz Monitor to 240Hz?
- Check your monitor’s specifications before changing anything
- How to overclock a 144Hz monitor to 240Hz using its built-in settings
- Can a custom resolution force 144Hz up to 240Hz?
- Verify the refresh rate in Windows
- Test for frame skipping, flickering, and display errors
- Troubleshoot common monitor overclocking problems
- Is 240Hz worth pursuing for gaming?
- Frequently asked questions
- Final verdict
Can You Overclock a 144Hz Monitor to 240Hz?
Usually, you should not expect a standard 144Hz monitor to reach 240Hz through overclocking alone. Going from 144Hz to 240Hz requires a 66.7% increase in refresh rate, which is far beyond the small increase supported by many monitors that offer an overclocking option.
Manufacturer documentation illustrates why the exact model matters. ViewSonic documents a monitor whose 144Hz refresh rate can be overclocked to 165Hz. Dell, meanwhile, documents a specific gaming monitor with selectable overclock settings up to 280Hz, but those settings apply to that model rather than to 144Hz monitors in general.
A custom refresh-rate setting in Windows or a graphics driver does not change the physical capabilities of a panel. A mode may be rejected, produce a black screen, cause flickering, or appear to work while skipping frames. NVIDIA specifically warns that custom display modes outside a monitor’s advertised specifications may cause permanent damage and may affect the warranty.1
The realistic goal is therefore to find the highest refresh rate your specific monitor officially supports or can demonstrably display without instability. If its documented maximum is 144Hz and the manufacturer provides no overclocking feature, keep it at 144Hz rather than forcing a 240Hz signal.
Check your monitor’s specifications before changing anything
Before attempting a refresh-rate overclock, identify the exact monitor model and establish which settings the manufacturer supports. A generic description such as “27-inch 144Hz gaming monitor” is not enough because different products can use different panels, display controllers, firmware, and input limitations.
Find the supported refresh-rate range
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Find the model number on the rear label, in the monitor’s on-screen display (OSD), or in your purchase documentation.
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Open the manufacturer’s official product page and user manual.
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Look for the maximum refresh rate at your native resolution, supported HDMI and DisplayPort modes, and any section describing overclocking.
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Determine whether the listed maximum is a standard operating mode or a manufacturer-enabled overclock.
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Check whether enabling overclocking requires a specific connection, firmware version, or additional setting.
Do not assume that a monitor capable of 144Hz at 2560 × 1440 can operate at 240Hz at that resolution. Resolution and refresh rate work together, and the monitor may have different limitations for different input modes.
Check the cable and graphics output
Use a direct connection between your graphics card and monitor whenever possible. Start with the DisplayPort or HDMI cable recommended by the manufacturer, and make sure you are using a port that supports the desired refresh rate.
An adapter, docking station, KVM switch, or older cable can introduce another limitation. However, replacing a cable cannot increase the actual capabilities of a panel that is limited to 144Hz.
Also install an appropriate, stable graphics driver. Confirm that the selected display is connected to the graphics output you intend to use and that any additional displays are not causing a configuration issue.
If the manufacturer states that your model supports only 144Hz, with no approved overclocking mode, stop here. You can still improve gaming smoothness through other methods, but forcing a 240Hz timing is not a reliable upgrade path.
How to overclock a 144Hz monitor to 240Hz using its built-in settings
The safest method is to use the monitor’s own overclocking feature, if one exists. This setting is more meaningful than simply typing a higher number into Windows because it is implemented as part of the monitor’s intended operating configuration.
Step 1: Open the monitor’s OSD menu
Use the physical buttons or joystick on the monitor to open its settings menu. Depending on the manufacturer, look under sections such as Gaming, Game, Display, System, or Refresh Rate.
Search for a setting named Overclock, Overclocking, OC, or Maximum Refresh Rate. The exact name and menu location vary by model.
A documented example is the ViewSonic XG270QG, whose OSD provides an overclocking option that raises its 144Hz operating rate to as high as 165Hz. The important point is that this feature has a model-specific limit; it does not imply that other monitors can reach 165Hz or 240Hz.
Step 2: Enable only the supported overclock
If your monitor has a documented overclock setting, enable it and select the highest refresh rate allowed by that feature. Do not assume that enabling an overclock automatically selects the highest rate in Windows; the operating system may require a separate selection.
If the menu offers 150Hz, 160Hz, or 165Hz but not 240Hz, treat the highest listed setting as the supported ceiling. Do not use another monitor’s menu instructions to force an unavailable option.
Dell’s G2723H provides another example of a model-specific implementation. Its documented overclock menu offers 250Hz, 260Hz, 270Hz, and 280Hz, and Dell specifies DisplayPort 1.4 for reaching 280Hz on that model. Dell also warns that overclocking may cause flickering or abnormal video. These instructions apply to the G2723H, not to a generic 144Hz monitor.
Step 3: Confirm the operating system recognizes the new rate
After enabling the feature, move to Windows display settings and check whether the new refresh-rate option appears. Select it only if it is supported by the monitor’s documented operating mode.
If there is no overclocking option in the OSD, consult the manual before experimenting with a custom display mode. Some displays offer no manufacturer-supported overclocking path at all.
Can a custom resolution force 144Hz up to 240Hz?
Graphics software can create custom display modes, including refresh rates that are not listed among the standard options. However, creating a custom mode is not the same as making an unsupported monitor capable of displaying it.
NVIDIA provides a custom-resolution tool in its Control Panel, and AMD Software: Adrenalin Edition provides a similar capability. Both manufacturers explain that custom modes depend on display compatibility. NVIDIA explicitly warns about possible permanent damage and warranty consequences when operating beyond advertised specifications.
For that reason, the following procedures are appropriate for investigating a modest overclock only when the monitor’s documentation permits it. They are not instructions to force an unsupported 240Hz mode onto a 144Hz display.
Step 4: Create a custom mode with NVIDIA Control Panel
If the exact monitor model supports custom refresh rates within a documented operating range, use the following procedure.
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Right-click the Windows desktop and open NVIDIA Control Panel.
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Select Display, then Change resolution.
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Select the monitor you want to configure.
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Choose Customize and then Create Custom Resolution, if those options are available.
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Keep the monitor’s native resolution unchanged and enter a small refresh-rate increase within the permitted range.
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Select Test and follow the on-screen result. Save the mode only if the test succeeds and the monitor remains stable.
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If the test fails, allow the previous display mode to return. Do not repeatedly force the same failed setting.
NVIDIA’s official instructions describe the test-and-confirm process, including the possibility that an unsupported mode produces an out-of-range message or a black screen.
For a 144Hz monitor, a small increment such as 150Hz is a more sensible experiment than jumping directly to 240Hz, provided the manufacturer allows custom overclocking. If the model’s supported maximum is 144Hz, do not treat this example as permission to exceed that limit.
Step 5: Create a custom mode with AMD Software
For a Radeon graphics card, AMD Software: Adrenalin Edition offers a Custom Resolution feature.
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Open AMD Software: Adrenalin Edition.
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Search for Custom Resolution within the application.
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Select the intended display if multiple displays are connected.
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Choose the option to create a new custom resolution.
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Keep the native resolution and enter a refresh rate that falls within the monitor’s permitted range.
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Create the profile and allow the software to check compatibility.
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If the profile is accepted, select it through Windows display settings or the relevant application. If compatibility issues are reported, do not force the setting.
The names and placement of controls can vary with the software version. AMD states that custom display modes are not universally compatible and recommends checking the display’s user manual for compatibility information.
Neither graphics utility guarantees that a custom refresh rate will work correctly. An accepted mode may still require additional testing to determine whether the monitor displays every frame properly.
Verify the refresh rate in Windows
Once you have enabled a supported overclock, confirm that Windows is actually running at the intended refresh rate.
Step 6: Select the correct refresh rate
In Windows 11, follow these steps:
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Open Settings.
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Select System, then Display.
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Open Advanced display.
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Select the correct monitor if more than one is connected.
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Find Choose a refresh rate and select the desired supported value.
Microsoft explains that the available refresh-rate options depend on the display and the modes it supports. If 240Hz is absent, Windows may not have access to a compatible 240Hz mode for the selected display and connection.
Check the monitor’s own information screen too, if it reports the incoming resolution and refresh rate. This provides another way to confirm that the signal is being received at the intended frequency.
A Windows dropdown showing 240Hz does not establish that a nominally 144Hz monitor is displaying 240 unique frames per second. It only confirms that the operating system has selected that display mode. Frame skipping and stability need separate checks.
Test for frame skipping, flickering, and display errors
A higher number is not useful if the monitor cannot display the signal consistently. After changing any permitted overclock setting, test the image before using it for competitive gaming or other demanding work.
Step 7: Check for visual artifacts
Use the desktop and several applications to look for:
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Flickering or brief black screens.
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Horizontal lines, corrupted pixels, or unusual colors.
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Random signal loss or repeated reconnecting.
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Blurred motion or ghosting that becomes noticeably worse.
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Unusual behavior when switching between full-screen and windowed applications.
Run the monitor at the proposed refresh rate for a reasonable period, then test a game or another application that produces continuous motion. A mode that works for a few seconds may not remain stable under normal use.
If any of these symptoms appears, return to the previous stable refresh rate. Do not keep raising the frequency in the hope that the problem will disappear.
Step 8: Check whether the monitor skips frames
A frame-skipping test helps distinguish an actual improvement from a display mode that accepts a high refresh-rate signal but does not show every frame.
The TestUFO Frame Skipping Checker provides a visual test. It asks you to photograph the moving pattern with a camera, using an exposure of approximately 1/10 second or longer. A properly captured image should show a continuous sequence of squares rather than gaps in the sequence. A normal screenshot cannot reveal the same information because it captures a rendered image rather than a sequence of display refreshes.
To perform the test:
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Set Windows to the refresh rate you want to evaluate.
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Close other browser tabs and applications that may interfere with test performance.
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Open the frame-skipping test in a compatible browser and wait until it indicates that it is ready.
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Photograph the pattern using the recommended exposure.
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Inspect the sequence for missing squares, following the test’s instructions.
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Repeat the test if the photo is unclear or the browser reports performance problems.
A frame-skipping test is one piece of evidence, not a guarantee of long-term reliability. Check for instability in normal desktop use and games too. If the result is questionable, lower the refresh rate and compare again.
Troubleshoot common monitor overclocking problems
| Problem | Likely explanation | Recommended response |
|---|---|---|
| The 240Hz option is missing | The monitor, input, cable path, or graphics output may not support that mode. | Check the exact model specifications and use a supported port and cable. |
| The screen goes black after selecting a custom mode | The monitor may reject the timing or lose the signal. | Allow the previous mode to return, then select the last stable rate. |
| The image flickers at a higher refresh rate | The overclock or signal configuration may be unstable. | Reduce the refresh rate and return to the manufacturer-supported setting if necessary. |
| Windows shows 240Hz, but motion appears inconsistent | Frames may be skipped, or the browser or game may not render frames consistently. | Check the display mode, run a frame-skipping test, and compare with a stable setting. |
| The picture becomes blurry or shows more ghosting | The panel may not transition between pixels cleanly at the higher rate, or motion-processing settings may be unsuitable. | Return to a lower stable refresh rate and compare motion quality. |
| HDR, variable refresh rate, or another display feature stops working | The custom mode may conflict with the monitor’s supported feature combinations or connection bandwidth. | Restore a documented mode and check the manual for compatible settings. |
Do not assume that every problem is caused by the panel itself. Cables, drivers, multi-monitor configurations, graphics settings, and application behavior can also cause problems. However, troubleshooting should start by returning to a known-good display mode rather than continuing to push the overclock.
How to recover from a black screen
If the image disappears after selecting a custom refresh rate, wait for the graphics utility or operating system to revert to the previous mode. NVIDIA’s test procedure is designed to return the image when a tested mode fails. If Windows still displays an image but runs at a lower refresh rate, open Advanced display and select the last known stable setting.
If necessary, disconnect any unnecessary secondary display, remove the unsupported custom profile, and restart the computer. If you cannot regain a usable display, follow your graphics card and Windows recovery documentation rather than repeating the failed overclock attempt.
Once the original resolution and refresh rate have been restored, test the system at its normal settings before attempting anything else.
Is 240Hz worth pursuing for gaming?
A genuine 240Hz display can be useful in fast-paced games because it can refresh more frequently than a 144Hz display. At 144Hz, one refresh interval is approximately 6.94 milliseconds; at 240Hz, it is approximately 4.17 milliseconds. The difference between those intervals is about 2.77 milliseconds.
Those figures describe refresh intervals, not guaranteed reductions in total input latency. Actual responsiveness also depends on the game’s frame rate, GPU performance, input processing, panel response, and other parts of the display pipeline.
To benefit from 240Hz, your system also needs to render frames quickly enough to make use of the additional refresh opportunities. A monitor’s refresh rate and a game’s frame rate are separate measurements: setting a display to 240Hz does not force a game to render at 240 FPS.
If you play competitive shooters and regularly exceed 144 FPS, moving to a monitor designed for native 240Hz operation may be a more dependable upgrade than attempting a large unsupported overclock. When comparing monitors, verify the maximum refresh rate at your intended resolution and connection, not just the largest number advertised in the product name.
If your existing monitor is stable at 144Hz, you may get more practical value from improving game settings, reducing unnecessary background workloads, or configuring variable refresh rate correctly than from trying to force the display into an unsupported mode.
Frequently asked questions
Can I overclock a 144Hz monitor to 240Hz without changing the resolution?
Only if the monitor and its signal path support that operating mode. Keeping the native resolution is preferable when testing a permitted overclock, but it does not make an unsupported 240Hz mode safe or possible.
Will custom-resolution software unlock 240Hz?
Not by itself. NVIDIA Control Panel and AMD Software can create custom display modes, but they cannot guarantee that the panel can display every refresh. A successful mode test is not proof that every frame is displayed correctly.
Can overclocking damage a monitor?
Operating beyond the manufacturer’s advertised specifications carries a risk. NVIDIA warns that an unsupported custom refresh rate may cause permanent damage and may affect the monitor’s warranty. Check the warranty terms and avoid out-of-spec experimentation on a display you cannot afford to replace.
Should I settle for 165Hz instead of 240Hz?
A stable, supported 165Hz setting is preferable to a 240Hz mode that flickers or skips frames. The best setting is the highest refresh rate that your particular monitor can sustain with a clean image and reliable operation, not simply the largest number Windows allows you to select.
Final verdict
A standard 144Hz monitor should not be expected to reach 240Hz through overclocking. Start with the manufacturer’s specifications and built-in OSD features, use custom modes only within a documented or otherwise supported operating range, and verify both visual stability and frame delivery. If your monitor is limited to 144Hz or a modest overclock such as 165Hz, a native 240Hz monitor is the dependable route to a genuine 240Hz gaming experience.
