SpeedFan 4.49

A program to control your computer's fan speed and monitor other aspects of the hardware

  • Category:

    Analysis & Optimization

  • Version:


  • Works under:

    Windows XP / Windows 8 / Windows ME / Windows 7 / Windows 98 SE / Windows 2000 / Windows Vista / Windows 95 / Windows 98

  • Program available in:In English
  • Program license:Free
  • Vote:
    6.2 (254)
SpeedFan 4.49
SpeedFan 4.43

SpeedFan is a great tool for those who want to run deep diagnostics on their computer. It allows for users to see what is going on with their systems at any point in time. It is not limited to software but also tells the temperature of different components, how fast the fans are moving, and even how hard drives are doing. It is incredibly in-depth and definitely for the very experienced computer users.

While this tool can seem very overwhelming at first, SpeedFan is good at taking large amounts of data and compressing them into more palatable formats. SpeedFan sends it's users warnings and updates, as well as graphs and charts that show the health of the user's computer.

These tools come in handy for those who want to get the most out of their computer or laptop or those who simply want to know that everything is running smoothly at all times. It is a completely free download. It is currently offered on Windows 98, Windows 98 SE, Windows ME, Windows 2000, Windows XP, Windows Vista, Windows 7, and Windows 8. It is currently offered in fourteen different languages, including English and Spanish. The download size is relatively small. It is quite easy to download.

There have been some complaints about SpeedFan that on newer operating systems it does not allow for them to use all the features. There have also been complaints that it may pose some security threats. It also requires admin rights at each and every login, which can be incredibly annoying, especially for a heavy user.

Overall, SpeedFan is a great tool for users who want to maximize their computer and push it to its limits. It may be too overwhelming for novices and for those who are unfamiliar with the inner-workings of a computer. But it is a good way to stay on top of the health of any computer.


  • Good tool for diagnostics
  • Keeps users up-to-date
  • Completely free to download


  • Not user-friendly
  • May not run on newer computers
  • May pose security threat
  • Requires admin information before launching

SpeedFan puts you in control of your computer's sensors, enabling you to monitor the system's voltages, fan speeds and component temperatures. This application is ideal for diagnosing heat issues inside your computer and making adjustments to combat them. If cooling isn't an issue, use SpeedFan to lower the speeds of fans inside of your computer and reduce the noise they generate. SpeedFan is an invaluable application for any user who repairs, tweaks and upgrades the components inside their computers.

Monitoring Abilities

SpeedFan's Readings tab displays a full report of your system's fan speeds, temperatures and voltages. Fans are flanked by their RPMs, or revolutions per minute, but only the GPU fan is identified by name. Other fans are listed generically as "Fan1" or "Fan2." To determine which fan cools your CPU, the program's developers recommend revving your CPU and monitoring which fan responds; because you can monitor your CPU's usage in SpeedFan, you can quickly determine which fan corresponds to your CPU, graphics card and other key components.

SpeedFan also lets you monitor your system's internal temperatures and voltages under the Readings tab. Hard drive, GPU and GPU core temperatures are displayed in Celsius, so users who are used to Fahrenheit readings will have to do a little math or get used to seeing temperatures in the 70s as blazing instead of balmy.

The application's Charts tab helps you visualize temperatures, fan speeds and voltage in a graph. You can select which elements you'd like to visualize, and the tab's graph will chart it for you. Being able to customize your graphs is handy for seeing trouble spots quickly.

Fan and Voltage Adjustments

SpeedFan's configuration options allow you to define fan controllers and specify the PWMs, or pulse-width modulations, for the controllers. However, the software's developer describes linking PWMs and fan controllers a matter of trial and error, so be ready to return to default settings if the changes you make don't work well for your system.

The Verdict

SpeedFan is as reliable as the sensors inside of your computer; in other words, any erroneous data you receive is likely the fault of your sensors. The system's chief virtue is that it lets you monitor your computer's components from your operating system instead of forcing you to launch your computer's BIOS. SpeedFan has been evolving for years now, increasing its support for motherboards and temperature sensors, so each iteration of the application has shown improvements over its earlier versions. It's independently developed software and isn't perfect, but it offers invaluable monitoring capabilities.


  • Thorough reporting of sensor data
  • Compact user interface
  • Includes charting capabilities


  • Some features are incomplete

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