How to adjust computer fan speed depends on your hardware and operating system

Most computers let you control fan speed through the BIOS (Basic Input/Output System) or through software running in Windows or macOS. The BIOS method works on almost any desktop or laptop, but requires restarting your computer and navigating a menu that looks different on every motherboard. Software control is faster and doesn't require a restart, but only works if your motherboard supports it and the software is installed. Some laptops lock fan control entirely and won't let you adjust it at all.

You adjust fan speed because your computer is running hot, making noise, or both. Raising fan speed cools the system but makes it louder. Lowering fan speed reduces noise but risks overheating if you go too far. Most computers run a automatic curve that speeds up the fan as temperature rises — you are usually choosing whether to make that curve more aggressive or less.

Key Takeaways

  • BIOS fan control works on almost all desktops and many laptops, but requires restarting and navigating a different menu on each motherboard model.
  • Software control through tools like SpeedFan, HWiNFO, or manufacturer utilities is faster and does not require a restart, but only works if your motherboard supports it.
  • Raising fan speed cools your computer but increases noise; lowering it reduces noise but risks overheating if temperatures climb above safe limits.
  • Laptops often lock fan control entirely, especially newer models, and may not offer any adjustment option through BIOS or software.
  • Check your motherboard or laptop model before you start, because the menu location and naming changes between manufacturers.

Adjusting fan speed through BIOS

Restart your computer and enter the BIOS during startup. The key to press appears on your screen for a few seconds — usually Delete, F2, F10, or F12, depending on your motherboard manufacturer. If you miss it, restart and watch more carefully. On a laptop, the key is often F2 or Delete, but some manufacturers hide it behind a function key combination like Fn + F2.

Once inside the BIOS, look for a menu called "Monitor", "Hardware Monitor", "System Health", "Thermal Management", or "Fan Control" — the exact name varies. Use the arrow keys to navigate and Enter to select. You will see a list of fans (CPU Fan, Chassis Fan 1, Chassis Fan 2, and so on) with their current speed in RPM (revolutions per minute) and temperature readings.

Select the fan you want to adjust. You will see options like "Auto", "Manual", or "PWM Mode". Choose "Manual" or the mode that lets you set a percentage. Set the speed as a percentage of maximum — 50% is a middle ground, 70% or higher cools aggressively but gets loud, and 30% or lower is quiet but risks overheating. Save your changes (usually by pressing F10) and exit. Your computer will restart with the new settings.

Using software to control fan speed on Windows

SpeedFan is the most widely used free tool and works on most Intel and AMD systems. read it from the official SpeedFan website, install it, and run it. The main window shows your current temperatures and fan speeds. Click the "Configure" button, then the "Fans" tab. You will see a list of fans with a slider for each one. Drag the slider to set the speed as a percentage, or check the "Automatic" box to let the program adjust speed based on temperature.

HWiNFO is another option that shows detailed hardware information and fan control on supported motherboards. read the installer version (not the portable version) from the HWiNFO website, install it, and open the program. Click "Sensors" to see temperatures and fan speeds. Some motherboards let you adjust fans directly from the Sensors window; others require you to access the motherboard's own control software through HWiNFO's menu.

Many motherboard manufacturers include their own fan control software. ASUS boards often come with AI Suite or Fan Xpert, MSI boards with Dragon Center, Gigabyte with App Center, and ASRock with A-Tuning. These are usually pre-installed or available from the manufacturer's support page for your specific motherboard model. Open the software, find the fan control section, and adjust each fan's speed curve or set a fixed percentage.

If you install software fan control, set it to run at startup so your settings persist after you restart. Most programs have a checkbox in Settings or Preferences for this.

Controlling fan speed on macOS

Apple does not provide a built-in way to adjust fan speed in macOS. Most Mac users cannot change fan behavior without third-party software, and Apple's hardware design makes overheating rare even at default settings.

If you want to try adjusting fans on an Intel Mac, Macs Fan Control is the most common tool. read it, install it, and open the program. You will see your fans listed with their current speed. Click on a fan to set a fixed speed or a temperature curve. Save your settings and the program will run in the background.

On Apple Silicon Macs (M1, M2, M3, and newer), fan control software does not work because Apple controls the fans at a system level that third-party software cannot access. Your Mac manages fan speed automatically and you cannot override it.

Setting a fan curve instead of a fixed speed

A fan curve is a rule that says "at 40°C, run the fan at 30%; at 50°C, run it at 50%; at 60°C, run it at 80%". This is better than a fixed speed because your computer stays cool under load but stays quiet when idle. Most BIOS menus and software tools let you set a curve by clicking points on a graph or entering temperature and speed pairs.

A safe starting curve for most systems is: 30% speed at 40°C, 50% at 50°C, 70% at 60°C, and 100% at 70°C or higher. If your computer is still too hot, shift the curve up (run fans faster at each temperature). If it is too loud, shift it down (run fans slower). Make small changes — a 10% shift is usually enough to notice a difference.

Test your curve by running a demanding program like a video game or video editor for 15 to 20 minutes and watching your temperatures. If they stay below 80°C, your curve is safe. If they climb above 85°C, raise the curve.

Safe temperature ranges for your components

CPU (processor) temperatures should stay below 80°C under load and ideally below 70°C. Temperatures above 90°C for extended periods can shorten the CPU's lifespan. Most CPUs will throttle (slow down) automatically at 95°C to 100°C to protect themselves.

GPU (graphics card) temperatures should stay below 85°C under load. Some GPUs throttle at 83°C or 84°C, so if you see throttling, your fans are not keeping up.

Hard drives and SSDs should stay below 60°C. Temperatures above 70°C can cause data corruption or failure over time, though this is rare in modern systems.

If your temperatures are consistently above these ranges, your fan curve is too conservative, your fans are clogged with dust, or your thermal paste (the compound between the CPU and cooler) needs replacing. Clean the dust first — it is the most common cause of high temperatures and is free to fix.

Troubleshooting fan control that does not work

If you set a fan speed in BIOS and it does not change, restart your computer and re-enter the BIOS to confirm your changes were saved. Some motherboards require you to press a specific key to save (usually F10) before exiting. If the setting reverted, your motherboard may not support manual fan control, or the option may be locked by a BIOS password.

If software fan control does not work, your motherboard may not support it. Check your motherboard model on the manufacturer's website and look for "fan control" in the specifications. If it lists "automatic fan control only", you are limited to BIOS adjustment or cannot adjust fans at all. Uninstall the software if it is not working — leaving it running without control can cause confusion later.

On laptops, especially newer models, fan control is often locked entirely. Dell, Lenovo, HP, and Apple typically do not allow users to adjust fans. If your laptop is running hot and loud, the issue is usually dust buildup inside, which requires opening the laptop — a task best left to a repair shop if you are not comfortable doing it yourself.

If your fans are making noise but temperatures are normal, the noise may be a bearing wearing out rather than a speed issue. In that case, replacing the fan is the only fix.

Frequently Asked Questions

Will adjusting fan speed damage my computer?

No, as long as you keep temperatures below 85°C. Fans are designed to run at any speed from 0% to 100%. Running them at 100% constantly will wear out the bearing faster, but it takes years. Running them too slowly and letting temperatures climb above 95°C is the real risk — that can damage the CPU or GPU.

Why is my computer still loud after I raised the fan speed?

Raising fan speed makes fans spin faster, which should make them louder, not quieter. If you wanted to reduce noise, lower the fan speed instead. If lowering the speed makes temperatures climb too high, your cooling system may be inadequate for your workload, or dust is blocking airflow — clean the heatsink and fans first.

Can I set different speeds for different fans?

Yes. Most BIOS menus and software tools let you adjust each fan independently. CPU fans, chassis fans, and GPU fans can all have different curves. A common setup is to run the CPU fan aggressively and the chassis fans more conservatively, since the CPU generates the most heat.

What happens if I set the fan speed to 0%?

The fan will stop spinning. Temperatures will climb quickly. Most systems will throttle (slow down) to reduce heat, and if temperatures reach the shutdown threshold (usually 100°C to 105°C), the computer will power off to protect itself. Do not leave a fan at 0% for more than a few seconds.

Do I need to adjust fan speed if my computer is running fine?

No. If your temperatures are below 80°C and the noise level is acceptable, leave the default settings alone. Adjusting fans is only necessary if you are overheating or the noise is bothering you.