SpeedFan is a freeware program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips. SpeedFan can even access S.M.A.R.T. info for those hard disks that support this feature and show hard disk temperatures too, if supported. SpeedFan supports SCSI disks too. SpeedFan can even change the FSB on some hardware.

SpeedFan can access digital temperature sensors and can change fan speeds accordingly, thus reducing noise. SpeedFan can find almost any hardware monitor chip connected to the 2-wire SMBus (System Management Bus (trademark belonging to SMIF, Inc.), a subset of the I2C protocol) and works fine with Windows 9x, ME, NT, 2000, 2003, XP and Windows Vista. It works with Windows 64 bit too.

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

SpeedFan 4.38 has added:
-added full support for AMCC/3ware SMART readings
-added full support for Intel QST
-added full support for ADT7470
-added full support for ADT7462
-added full support for nVidia MCP79 SMBus
-added full support for SiS968 SMBus
-added full support for Intel i7 internal core temperature reading
-improved ITE IT8720F identification
-added Fintek F71858 temperature readings
-PC87360, PC87362, PC87363, PC87364, PC87366 do hide unavailable readings now
-ProbeGL5xxSM now checks some more registers to try to avoid false detections
-improved CPU identification routines
-improved FB-DIMM support on some Intel chipsets
-the exotics tab now shows the fitness of the hard disks connected to ARECA RAID controllers too
-ARECA and AMCC/3WARE connected hard disks are now searched before the standard channels, trying to avoid aliased, merged or fake reported SMART data
-added identification of Fintek F75125R
-removed two debug messages related to UGURU3
-added some debug code to try to support VIA CX700/VX700 SMBus
-DELL SUPPORT is now checked on ATI SBx00, Intel 631xESB, ICH8, ICH9 and ICH10 too
-disabled DELL support on 64 bit systems
-added /NODELLSCAN command line parameter
-fixed daylight saving time handling in event emails
-added full support for Windows 7 32 and 64 bit
-fixed a minor bug that caused the main window to be minimized when clicked
-CONFIGURATION / SPEEDS SpinBoxes now allow manual edit
-added some scan exceptions for Asus M2N-E and for Dell 0G841G
-INSTALLER: improved OS identification
-INSTALLER: fixed the ADMIN identification issue

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