How to Get Your Gaming PC Running Smoothly at 120Hz

What You Need to Do to Hit 120Hz Consistently

Running a gaming PC at 120Hz means your monitor refreshes 120 times per second instead of the standard 60. To actually see that benefit, your graphics card and CPU have to work together to push at least 120 frames per second in the games you play. Most people who buy a 120Hz monitor then see frame rates drop to 80 or 90 because they haven't adjusted their settings. The fix is straightforward: lower graphics settings, enable frame rate caps, and make sure your drivers are current.

The real work happens in three places: your graphics card settings, your game settings, and your monitor connection. A 120Hz monitor connected with an old HDMI cable or DisplayPort version won't actually display 120Hz, even if your PC can produce it. Your graphics card needs to be told to output at 120Hz, not 60Hz. And your games need settings adjusted so the frame rate stays above 120 without dropping below that threshold mid-game.

Key Takeaways

Your monitor must be connected with DisplayPort 1.2 or newer HDMI (2.0 or higher) to display 120Hz; older cables cap you at 60Hz regardless of your PC power.
Set your monitor to 120Hz in Windows display settings, not just in the monitor's physical menu, or your PC will still output at 60Hz.
Lower in-game graphics settings (resolution, shadow quality, ray tracing) until your frame rate stays consistently above 120 in the areas where it drops most.
Enable V-Sync or a frame rate cap at 120Hz in your graphics card control panel to prevent screen tearing and reduce unnecessary strain on your hardware.
Update your graphics card drivers monthly, as driver updates often improve frame rates by 5 to 15 percent in popular games.

Check Your Monitor Cable and Connection Type

The cable between your monitor and PC is the first bottleneck. HDMI 1.4 and older versions cannot carry a 120Hz signal at 1080p or higher resolution. If your monitor came with an HDMI cable, it is almost certainly too old. You need either DisplayPort 1.2 or newer, or HDMI 2.0 or higher. DisplayPort 1.4 is ideal if your monitor and graphics card both support it.

Check what your monitor actually has on the back. Most gaming monitors sold in the last five years have at least one DisplayPort port. If you have a DisplayPort port available, buy a DisplayPort 1.2 cable (they cost $10 to $20) and use that instead of HDMI. If your monitor only has HDMI, verify the version printed on the back or in the manual. If it says HDMI 1.4 or earlier, you are limited to 60Hz no matter what else you do.

After you plug in the correct cable, restart your PC. Windows sometimes does not detect the new connection type until you reboot.

Set Your Monitor to 120Hz in Windows Display Settings

Plugging in the right cable is not enough. Windows defaults to 60Hz even when your monitor and cable support higher rates. Right-click on your desktop and select Display settings. Scroll down to the bottom and click Advanced display settings. Look for a dropdown or button labeled Refresh rate and change it from 60Hz to 120Hz. Click explore.

Windows will ask you to confirm the change. If your screen goes black or flickers, click Revert and try again — this usually means your cable or monitor does not actually support 120Hz at your current resolution. If the change sticks, you are done with this step. Your monitor is now set to 120Hz.

Some monitors also have a physical menu where you can set the refresh rate. This is separate from the Windows setting and usually not necessary, but if your monitor has an on-screen menu, you can check it to confirm it is also set to 120Hz. The Windows setting is what matters for your PC output.

Lower Graphics Settings Until Frame Rate Stays Above 120

Now that your monitor is ready, your graphics card has to produce 120 frames per second. Start with the game you play most. Launch it and open the graphics settings menu. You will see options like resolution, shadow quality, ray tracing, texture quality, and draw distance. The biggest frame rate hits come from resolution, ray tracing, and shadow quality — in that order.

If you are running at 1440p or 4K and not hitting 120 frames, drop to 1080p first. The difference in image sharpness is smaller than the frame rate gain. If you are already at 1080p, turn off ray tracing entirely. Ray tracing looks better but costs 20 to 40 percent of your frame rate. Set shadows to Medium or Low instead of Ultra. Disable motion blur and depth of field — these make the image look softer and cost frame rate for no visual benefit at high refresh rates.

Launch the game and play for a few minutes in the area where frame rate usually drops (often during heavy action or in crowded areas). If frame rate dips below 120, lower one more setting and test again. Repeat until your frame rate stays above 120 even in the worst-case areas. This process takes 10 to 20 minutes per game but is the only way to know your settings are stable.

Enable V-Sync or Frame Rate Cap in Your Graphics Card Settings

Once you are hitting 120 frames consistently, enable V-Sync or a frame rate cap to prevent screen tearing and reduce unnecessary load on your hardware. Screen tearing happens when your graphics card outputs frames faster than your monitor can display them, causing visible horizontal lines across the screen.

For NVIDIA cards, open NVIDIA Control Panel, go to Manage 3D Settings, and set Vertical Sync to On. For AMD cards, open AMD Radeon Settings, go to Graphics, and enable Wait for Vertical Refresh. Alternatively, many modern games have a frame rate cap option in their own graphics menu — set it to 120Hz there instead. A frame rate cap is often smoother than V-Sync because it prevents the frame rate from bouncing between 120 and 60.

If you enable V-Sync and notice input lag (your mouse or keyboard response feels delayed), disable it and use a frame rate cap instead. Frame rate caps have less input lag than V-Sync in most games.

Update Your Graphics Card Drivers

Graphics card manufacturers release driver updates every month or two. These updates often include frame rate improvements for popular games — sometimes 5 to 15 percent faster in specific titles. Outdated drivers are a common reason people cannot hit their target frame rate.

For NVIDIA, read the latest driver from nvidia.com/read/driverDetails. For AMD, go to amd.com/en/support and search for your card model. read the driver installer, run it, and restart your PC. Check for updates once a month if you play new games regularly.

After updating drivers, test your frame rate again in your main games. You may find you can increase graphics settings and still hit 120Hz, or that frame rate is now more stable during heavy action.

Monitor Temperature and Power Settings

Running your graphics card at high frame rates generates heat. If your PC is in a hot room or has poor airflow, thermal throttling can kick in — your graphics card automatically reduces its speed to cool down, dropping your frame rate below 120. Check your GPU temperature while gaming. Most graphics cards run safely up to 80°C, but performance is best below 75°C.

If temperatures are high, clean the dust out of your PC case and graphics card fans with compressed air. Make sure your case has at least one intake fan and one exhaust fan. If your room is very hot, consider adding a case fan or improving room ventilation.

Also check that your power supply has enough capacity. A graphics card that is power-starved will throttle its performance. Your power supply should have at least 50 watts of headroom above your system's total power draw. If you are unsure, look up your graphics card's power requirement and your CPU's power requirement, add them together, and make sure your power supply is rated at least 100 watts higher.

Frequently Asked Questions

Do I need a new graphics card to hit 120Hz?

Not necessarily. A graphics card from three to five years ago can hit 120Hz in most games if you lower graphics settings to Medium or High instead of Ultra. Newer cards (from the last two years) hit 120Hz at higher settings. The older your card, the more settings you will need to lower.

Why does my frame rate drop below 120 during gameplay even though it was stable in the menu?

Game menus are much less demanding than actual gameplay. Test frame rate in the area of the game where it typically drops most — usually during heavy action or in crowded areas. Lower one more graphics setting and test again in that same area.

Is 120Hz worth it if I can only hit it by lowering graphics to Medium settings?

Yes. The difference between 60Hz and 120Hz is much more noticeable than the difference between Medium and Ultra graphics. Higher frame rate makes movement smoother and input response faster, which matters more in competitive games. Most players prefer 120Hz at Medium settings over 60Hz at Ultra.

Can I use HDMI instead of DisplayPort for 120Hz?

Only if your monitor has HDMI 2.0 or newer. Check your monitor's manual or the port label on the back. HDMI 1.4 and older versions cannot carry 120Hz at 1080p or higher. DisplayPort 1.2 is more reliable and is the better choice if your monitor has both ports.

What should my GPU temperature be while gaming at 120Hz?

Below 80°C is safe, and below 75°C is ideal. If your GPU is running hotter than 80°C, clean dust from your case and graphics card fans, or add a case fan for better airflow. High temperatures reduce performance and shorten hardware lifespan.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.