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 (but this should be considered a bonus feature).

At the lowest level, SpeedFan is an hardware monitor software that can access digital temperature sensors, but its main feature is that it can change fan speeds (depending on the capabilities of your sensor chip and your hardware) according to the temperatures inside your pc, thus reducing noise.

SpeedFan can:

* handle almost any number of South Bridges
* handle almost any number of hardware monitor chips
* handle almost any number of temperature readings
* handle almost any number of voltage readings
* handle almost any number of fan speed readings
* handle almost any number of PWMs

Changelog:
greatly improved temperature reporting for almost all nVidia video cards
now fan speeds are lowered more aggressively
added support for AMD K11 temperature sensor
added full support for SMSC EMC6W201
added full support for SMSC SCH5127
added support for SMSC EMC2710P fan speed readings
ARECA RAID support updated to Build 270
added AMCC/3ware test code
improved IT8720F identification
fixed F1 context sensitive help key support
better identification of DIRECT RAMBUS modules
enabled Intel ICH8 SMBus, if needed
identified SMSC SCH5317
some addresses on the Asus P5N32-E SLI are no longer scanned
some addresses on the Asus Rampage Formula are no longer scanned
some addresses on EVGA NFORCE 680i LT SLI are no longer scanned