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SpeedFan 4.44 in Windows 7
SpeedFan 4.44 in Windows 7
Original author(s)Alfredo Milani Comparetti[1]
Developer(s)Alfredo Milani Comparetti
Initial release27 March 2001; 17 years ago (2001-03-27)[2]
Stable release4.52 (29 June 2016; 2 years ago (2016-06-29)) [±]
Preview release4.51 beta 2 (7 August 2014; 4 years ago (2014-08-07)) [±]
Written inDelphi, C++, C[citation needed]
Operating systemWindows 95 and later[1]
TypeSystem monitor

SpeedFan is a system monitor for Microsoft Windows that can read temperatures, voltages and fan speeds of computer components.[3] It can change computer fan speeds depending on the temperature of various components.[1][4] The program can display system variables as charts and as an indicator in the system tray.[1][4][5] Fully configurable user events can be defined to execute specific actions based on system status.

Hard disk support[edit]

SpeedFan also monitors S.M.A.R.T. readings for EIDE, SATA and SCSI hard disks. Starting with version 4.35, SpeedFan fully supports Areca RAID controllers. Version 4.38 added full support for AMCC/3ware SATA and RAID controllers.[1]

Hard disk in-depth online analysis[edit]

SpeedFan offers a feature named "in-depth online analysis" that compares the hard disk's S.M.A.R.T. data to a database with statistical models of hard disks allowing early detection of potentially degraded hard disks.[6] Messages inform the user of specific situations and problems, which Almico says is “as if a human expert had looked at the data”.[1]


An extended review of version 4.46 in 2012 on the Silent PC Review website summarized, "The biggest drawback [to Speedfan] is it often takes a lot of work to properly configure", but continued, "Its highly customizable and incredibly powerful nature is unmatched by the competition and as a bonus, it's also free, lightweight and regularly updated with more features and better motherboard support."[7] The Softonic review of version 4.49 graded SpeedFan 8/10, listing it as useful, with "helpful charts to monitor performance and health", but noting that it requests administrator rights at launch, and "Can be intimidating for less tech savvy".[8]

Current alternatives to SpeedFan include Open Hardware Monitor, Motherboard Monitor and RealTemp, and many vendor-specific software (i.e. motherboard, hard drive, etc utilities supplied by the vendor).

See also[edit]


  1. ^ a b c d e f g "SpeedFan - Access temperature sensor in your computer". Almico.com. 12 October 2006. Retrieved 15 January 2007.
  2. ^ "SpeedFan - History". Almico.com. Archived from the original on 5 April 2001. Retrieved 22 November 2013.
  3. ^ Constantine A. Murenin (2007-04-17). "3.1. SpeedFan". Generalised Interfacing with Microprocessor System Hardware Monitors. Proceedings of 2007 IEEE International Conference on Networking, Sensing and Control, 15–17 April 2007. London, United Kingdom: IEEE. doi:10.1109/ICNSC.2007.372901. ISBN 1-4244-1076-2. IEEE ICNSC 2007, pp. 901—906.
  4. ^ a b Martin, Jim (21 August 2013). "How to check your CPU temperature: use the free SpeedFan utility". PC Advisor. Retrieved 22 November 2013.
  5. ^ Gralla, Preston (30 August 2011). "PC World Downloads - Speedfan 4.33". PC World. Retrieved 21 November 2013.
  6. ^ Savchenko (rarst), Andrey (7 August 2008). Brinkmann, Martin, ed. "Analyzing drive health with SpeedFan (4.34)". Ghacks blog. Retrieved 22 November 2013.
  7. ^ Lee, Lawrence (2 July 2012). "SpeedFan: A Guide to Universal Motherboard Fan Control". silentpcreview.com. Retrieved 22 November 2013.
  8. ^ Leong, Lewis. "SpeedFan (4.49)". Softonic. Retrieved 22 November 2013.

External links[edit]