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 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.

This is a very interesting release. It adds full support for a lot of new hardware. AMCC/3WARE users will be happy to see SMART data for all of their EIDE/SATA hard disks. Full Intel QST support has been added too (you need to RUN AS ADMIN on some OS). Support for new SMBuses (like nVidia MCP79 and SiS968) is there. New chips (like the ADT7470 and the ADT7462) have been added and support has been improved for some others. ITE IT8720 identification has been greatly improved. DELL support is now tested on more chipsets. Windows 7 32 and 64 bit has been added and verified. Both the installer and the executable are now digitally signed. A lot of refinements, improvements and bug fixes were applied.