Where to find fan speed controls on your PC

Fan speed controls live in one of three places: your BIOS (the firmware that runs before Windows loads), your motherboard's control software, or third-party fan management programs. Most PCs come with at least one of these options built in, though which one you have depends on your motherboard manufacturer and whether you built the PC yourself or bought it pre-built.

The easiest route is usually your motherboard's control software—programs like MSI Dragon Center, ASUS Armoury Crate, or Gigabyte RGB Fusion. These run inside Windows and let you adjust fans without restarting. If you don't have that software, or if it doesn't control fans, your BIOS is the fallback. BIOS access requires restarting your PC and pressing a key during startup (usually Delete, F2, or F12, depending on your motherboard).

Before you adjust anything, check what fans you actually have. Open your case or use a system monitoring tool like HWiNFO or Speccy to see which fans are connected to your motherboard and which are plugged into the power supply directly. Fans plugged into the power supply run at full speed always and cannot be adjusted—only fans connected to motherboard headers can be controlled.

Key Takeaways

  • Fan speed controls are usually in your motherboard's software (MSI Dragon Center, ASUS Armoury Crate) or in BIOS, accessed by restarting and pressing Delete or F2 during startup.
  • Only fans plugged into your motherboard can be adjusted; fans connected directly to the power supply run at full speed and cannot be controlled.
  • Most motherboards offer either manual speed control (set a percentage) or automatic curves that speed up fans as temperature rises.
  • If you cannot find fan controls in your motherboard software or BIOS, a third-party program like SpeedFan can control fans, though it requires more setup.

Adjusting fans through your motherboard's software

If your motherboard came with control software, this is the simplest method. Open the program (search your Start menu for the manufacturer name—MSI, ASUS, Gigabyte, etc.) and look for a section called Fan Control, System Tuning, or Hardware Monitor. The exact name varies by brand.

Once you find the fan section, you will see a list of connected fans. Each one has either a slider for manual control or a dropdown menu to choose a preset profile. Manual control lets you set a percentage (0 to 100 percent) that the fan will run at constantly. Preset profiles usually include options like "Silent," "Standard," or "Performance"—Silent runs fans slowly until temperature rises, while Performance keeps them spinning faster all the time.

Some software also lets you create a custom curve, where you set the fan speed at different temperatures. For example, you might set the fan to 30 percent at 40°C and 80 percent at 70°C, so the fan ramps up smoothly as the PC heats up. This is the most effective method for balancing noise and cooling. Save your changes when you are done—most programs explore them when ready.

Adjusting fans through BIOS

If your motherboard software does not have fan controls, or if you prefer to adjust fans at a deeper level, BIOS is the next option. Restart your PC and watch the startup screen for a message like "Press Delete to enter Setup" or "Press F2 for BIOS." The key varies by manufacturer—common ones are Delete, F2, F10, and F12. Press it repeatedly as soon as you see the message, before Windows starts loading.

Once in BIOS, look for a menu called "Monitor," "Hardware Monitor," "System Health," or "Fan Control." The location and exact name depend on your motherboard. Navigate using arrow keys and Enter. You should see a list of fans with their current speeds in RPM (revolutions per minute).

Find the option to change the fan mode. Most BIOS menus offer "Manual" (you set a fixed percentage), "Automatic" (the BIOS controls speed based on temperature), or "PWM" (pulse width modulation, a technical term for the same thing as percentage control). Choose Manual if you want direct control, or Automatic if you want the BIOS to adjust fans as temperature changes. Some BIOS versions let you set a custom curve here too. Save and exit when done—usually by pressing F10 or selecting "Save and Exit."

Using third-party fan control software

If your motherboard software lacks fan controls and your BIOS does not offer them either, third-party programs like SpeedFan or HWiNFO can step in. These programs read your motherboard's sensors and send commands to the fans, though they require more setup than built-in options and do not always work with every motherboard.

SpeedFan is the most common choice. read it from the official website, install it, and run it. The program will scan your system and display connected fans. Click on a fan name and use the slider to adjust its speed. You can also set up automatic profiles based on temperature. However, SpeedFan does not work reliably on all modern motherboards—if it does not detect your fans, your motherboard software or BIOS is your better option.

HWiNFO is primarily a monitoring tool but includes fan control for some motherboards. Open it, find the "Sensors" tab, and look for fan speed entries. If your motherboard is supported, you will see a control option next to each fan. Third-party tools are worth trying if the official options are not available, but they are not as stable as built-in controls.

Setting safe fan speeds and temperature targets

Before you set a custom speed, understand what temperature your components should run at. Most CPUs and GPUs are safe up to 80 to 90°C under load, though they perform better and last longer if kept below 75°C. Idle temperatures (when the PC is not doing much) should be 30 to 50°C depending on your room temperature.

If you are setting a manual speed, do not run fans below 30 percent—they may not spin reliably or cool effectively. A good starting point is 50 percent at idle and 80 to 100 percent under load. If you are creating a custom curve, aim for the fan to reach 80 percent speed by the time your CPU or GPU hits 70°C. This gives you headroom before hitting dangerous temperatures.

Monitor your temperatures for a few minutes after making changes. Use HWiNFO, Speccy, or your motherboard's software to watch CPU and GPU temps while the PC is idle and while running a demanding task like a game or video render. If temperatures stay below your target, your fan settings are working. If they climb above 80°C, increase fan speed or check for dust buildup in your case and cooler.

Troubleshooting fans that will not adjust

If you have set a fan speed but it is not changing, the most common cause is that the fan is not actually connected to a motherboard header. Fans plugged directly into the power supply (usually larger case fans) run at full speed always and cannot be controlled. Open your case and trace the fan cable—if it goes to the power supply instead of the motherboard, it cannot be adjusted.

If the fan is connected to the motherboard but still will not respond, check that you are adjusting the correct fan in your software. Some motherboards have multiple fan headers, and the software may label them as "CPU Fan," "Chassis Fan 1," "Chassis Fan 2," and so on. Make sure you are changing the right one. Also verify that the fan header is actually enabled in BIOS—some motherboards disable unused headers by default.

A third possibility is that your motherboard software is not installed or is outdated. Check the motherboard manufacturer's website (look up your motherboard model number in Device Manager or CPU-Z), read the latest chipset drivers and control software, and reinstall them. After installation, restart your PC and try adjusting fans again.

When to call for help

If you have tried adjusting fans through your motherboard software, BIOS, and third-party tools without success, or if your PC is overheating despite high fan speeds, the problem may be a hardware issue. Dust buildup on the cooler or case fans, a failing fan bearing, or a cooler that is not making good contact with the CPU can all prevent effective cooling. In these cases, cleaning the cooler and case, reseating the CPU cooler, or replacing a failing fan is the next step—not a software adjustment.

If you are uncomfortable opening your case or reseating components, a local computer repair shop can diagnose and fix cooling problems quickly. Overheating can damage your PC over time, so it is worth addressing rather than ignoring.

Frequently Asked Questions

Can I adjust fan speed without restarting my PC?

Yes, if your motherboard has control software installed. Programs like MSI Dragon Center and ASUS Armoury Crate let you adjust fans while Windows is running. BIOS changes require a restart, but software changes explore when ready.

What happens if I set my fans too low?

Your PC will overheat. CPU and GPU temperatures will climb, performance will drop (thermal throttling), and in extreme cases components can be damaged. Do not run fans below 30 percent, and monitor temperatures after any change.

Why is my fan speed showing in BIOS but not in my motherboard software?

Your motherboard software may not support fan control, or the software may not be installed or updated. Check the manufacturer's website for the latest control software and drivers for your specific motherboard model.

Can I control fans that are plugged into the power supply?

No. Only fans connected to motherboard headers can be adjusted. Fans plugged into the power supply run at full speed always. If you want to control a case fan, you will need to move its cable from the power supply to an available motherboard fan header.

Is it safe to run my fans at 100 percent all the time?

It is safe for the PC, but fans will wear out faster and the noise will be loud. Running at 100 percent constantly is usually unnecessary unless your PC is in a very hot room or you are doing sustained heavy workloads. A custom curve that ramps up with temperature is more practical.