Monitor Flickers at High Refresh Rate: Fix It

Why monitors flicker at high refresh rates

A monitor flickers at high refresh rates when the signal between the graphics card and the panel is unstable. At 144Hz or 240Hz, the display refreshes the image more often per second, so any weakness in the connection becomes visible. The most common causes are cable bandwidth limits, incorrect refresh rate settings, and panel faults.

The graphics card outputs a digital signal through a cable to the monitor. Each refresh rate and resolution combination requires a certain amount of data bandwidth. If the cable cannot carry that data reliably, the monitor may drop frames or flicker. For example, a cable rated for lower bandwidth may struggle at 4K with a high refresh rate, while a 1080p panel at 240Hz may be fine on the same cable. For more on choosing a monitor, see the best gaming monitors for PC guide.

The refresh rate setting in Windows also matters. If the monitor is set to a refresh rate it cannot sustain, the panel may flicker. The monitor's native refresh rate is the one it is designed to run at, and setting it higher than that can cause instability. Learn more about monitor refresh rate meaning.

Check the cable and its bandwidth

The cable is the first thing to check when a monitor flickers at high refresh rates. A cable that is too old, too long, or damaged may not have enough bandwidth for the resolution and refresh rate you are using. DisplayPort and HDMI cables have different versions, and each version supports different maximum resolutions and refresh rates.

For example, a DisplayPort 1.4 cable can handle 4K at 120Hz, while a DisplayPort 2.1 cable can handle 4K at 480Hz or 8K at 165Hz with Display Stream Compression. HDMI 2.1 also supports high refresh rates at 4K. If your cable is an older version, it may not be able to carry the signal your monitor needs. Compare DisplayPort 1.4 vs 2.1 for gaming and HDMI 2.0 vs 2.1 for gaming.

To fix this, try a different cable that is rated for the bandwidth your monitor requires. Use a shorter cable if possible, as longer cables can lose signal strength. Also, make sure the cable is firmly connected to both the graphics card and the monitor.

Adjust the refresh rate in Windows

If the cable is fine, the next step is to check the refresh rate setting in Windows. Windows 11 lets you set the refresh rate for each display. If the monitor is set to a refresh rate it cannot handle, the panel may flicker.

To change the refresh rate, go to Settings, then System, then Display, then Advanced display. Select the monitor you are using and choose the refresh rate that matches its native specification. For example, if your monitor is rated for 144Hz, set it to 144Hz. If you are using a 240Hz monitor, set it to 240Hz. For detailed steps, see how to set monitor refresh rate.

If the flicker only happens at the highest refresh rate, try a lower one, such as 120Hz or 144Hz, to see if the issue goes away. This can help you determine whether the problem is the panel or the signal. For advice on choosing the right refresh rate, read what is a good refresh rate for gaming.

Update graphics drivers and monitor firmware

Outdated graphics drivers can cause display issues, including flickering. Graphics card vendors release driver updates that fix bugs and improve compatibility with monitors. Check the vendor's website for the latest driver for your graphics card and install it.

Monitor firmware updates can also fix flickering issues. Many monitors have firmware that can be updated through the monitor's on-screen menu or a USB connection. Check the monitor manufacturer's website for firmware updates and follow their instructions.

If you have a GeForce RTX 50 Series graphics card, the NVIDIA app provides Game Ready Drivers that are optimized for the latest games and displays. Keeping these drivers current can help prevent display problems.

Try a different port or cable

Sometimes the issue is a specific port on the graphics card or the monitor. Try connecting the monitor to a different DisplayPort or HDMI port on the graphics card. If you are using an adapter, try a direct connection instead.

Also, try a different cable. A cable that is damaged or of poor quality can cause flickering at high refresh rates. Use a cable that is certified for the bandwidth you need, such as a DisplayPort 2.1 or HDMI 2.1 cable for 4K high refresh rate.

If the flicker stops when you change ports or cables, the original port or cable was the problem.

Check for panel faults

If the flicker persists after checking the cable, settings, and drivers, the monitor panel itself may be faulty. A panel fault can cause flickering at any refresh rate, but it may be more noticeable at higher refresh rates.

To check for a panel fault, connect the monitor to a different computer or graphics card. If the flicker continues, the monitor is likely the problem. If the flicker stops, the issue is with the original graphics card or its connection.

If the monitor is under warranty, contact the manufacturer for support. Do not attempt to open the monitor or repair it yourself, as this can be dangerous and may void the warranty.

What to pick for your play

Questions

Why does my monitor flicker at 144Hz but not at 60Hz?

At 144Hz, the monitor refreshes the image more often, so any instability in the signal becomes more visible. This could be due to a cable that cannot handle the bandwidth, an incorrect refresh rate setting, or a panel fault. For more on choosing a monitor, see the best gaming monitors for PC guide.

Can a bad cable cause monitor flickering?

Yes, a cable that is damaged, too long, or not rated for the required bandwidth can cause flickering at high refresh rates. Try a different cable that is certified for the resolution and refresh rate you are using. Compare DisplayPort 1.4 vs 2.1 for gaming and HDMI 2.0 vs 2.1 for gaming.

How do I check my monitor's refresh rate in Windows?

Go to Settings, then System, then Display, then Advanced display. Select your monitor and check the refresh rate. Make sure it matches the monitor's native specification. For detailed steps, see how to set monitor refresh rate.

What should I do if my monitor still flickers after trying everything?

If the flicker persists after checking the cable, settings, and drivers, the monitor panel may be faulty. Contact the manufacturer for support if the monitor is under warranty.