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SpeedFan 4.50
Copyright 2000-2015 by Alfredo Milani Comparetti
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What is SpeedFan
SpeedFan SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips. SpeedFan can even access S.M.A.R.T. info and show hard disk temperatures. SpeedFan supports SCSI disks too. SpeedFan can even change the FSB on some hardware (but this should be considered a bonus feature). SpeedFan can access digital temperature sensors and can change fan speeds accordingly, thus reducing noise. SpeedFan works fine with Windows 9x, ME, NT, 2000, 2003, XP, Vista, Windows 7, 2008, Windows 8 and Windows Server 2012. It works with Windows 64 bit too.
Hover on the icons to read more about specific SpeedFan features.
temperatures cpu temperatures fans voltages SMART SCSI RAID
SpeedFan 4.51 Beta 4 is online!
Added support for new devices and motherboards. This beta defaults to no SCSI access if the Intel Storage Driver is found. Added a sanity check while scanning DMI and ACPI table (something odd was present in some BIOSes). ITE IT8620E (used on several Gigabyte boards) support has been greatly enhanced. Now SpeedFan can control up to 5 fans and report voltages too. Bug fixes and more, as always.
I need your reports from any system. Thank you!
SpeedFan 4.50 Final is online!
SpeedFan 4.50 Final is now online! It adds support for a lot of new hardware. The most interesting features should be full Nuvoton NCT6791D support. A lot of Asus lovers will appreciate it, but that chip is on many other motherboards too. Another interesting improvement is 3ware RAID controllers support on 64 bit systems. The whole 3ware support has been rewritten. More CPU Core temperatures are now reported and/or reported correctly. There are several fixes here and there.
What's more interesting, though, is that there is more to come! Stay tuned and check the beta area on this site :-)
Both the installer and the executable are digitally signed with my company's (SOKNO S.R.L.) certificate. If you download an installer that has not SOKNO's signature, then it is not SpeedFan!
Advanced Fan Control How-To
An article has been added to describe the long awaited new Advanced Fan Control method. You can find it here.
Release notes
4.50 - Added full support for Nuvoton NCT6791D (including fan control)
- Improved external (USB) hard disk detection (some were not properly detected on Windows 8)
- Added a new method to access hard disks connected to 3ware RAID controllers (works on 64 bit systems too)
- Added support for Intel core temperature (Family 06h Model 3Ch)
- Added support for Intel core temperature (Family 06h Model 3Eh)
- Added support for AMD Family 15h temperature
- Added support for AMD Family 16h temperature
- Added support for Intel 8 Series SMBus
- Added support for Intel 8 Series Mobile SMBus
- Added support for Intel 9 Series SMBus
How fan speed changing works
SpeedFan monitor temperatures from several sources. By properly configuring SpeedFan, you can let it change fan speeds based on system temperatures. When choosing parameters for the minimum and maximum fan speed, try to set them by hand (disable all the VARIATE FANs checkboxes) and listen to the noise. When you hear no noise from the fan then you can set that value as the minimum fan speed for that fan. I suggest to use 100 as the maximum value, unless you hear a lot of noise from it, in which case you might reduce the maximum speed to 95 or 90. You can set, say, 60 as the maximum value and, sometimes, I myself set it that way. Consider that when the WARNING temperature is reached, the program sets the fan speed to 100, whatever maximum speed you selected. One last word should be said regarding the USE FAN x listbox. In my pc, more than one temperature changes when a fan runs faster. You can configure on which fan every temperature should rely. On my system, TEMP1 and TEMP3 are both influenced by FAN1.
  • The first one to thank is Alexander Van Kaam, for letting me discover the wonderful world of sensors
  • Carlo Adami, for his great work on AS99127F
  • Massimiliano Battaglia, for his infinite patience debugging and reporting
  • Istvan Dercze, for his help testing VIA686 support
     Donate some EUR for SpeedFan :-)
A few numbers...
SpeedFan can handle:
  • almost any number of South Bridges
  • almost any number of hardware monitor chips
  • almost any number of hard disks
  • almost any number of temperature readings
  • almost any number of voltage readings
  • almost any number of fan speed readings
  • almost any number of PWMs
This program is aimed at the power user. At those who know what they're doing. I've known of no real problem caused by SpeedFan, but may be it's due to the fact that once it made the PC explode and the user disappeared in the blast, thus being unable to report :-) Anyway: SpeedFan can be extremely useful, but you should first watch its behavior before setting and forgetting it.
You can contact me at alfredo [at] if you've got any question or suggestion or discover any strange behavior. I'd appreciate an e-mail from those of you who try and find useful my program. Just a line of text will do.
Thanx for your attention.
You might consider to visit my Delphi Page.

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