SpeedFan monitors fan speeds, temperatures and voltages in computers with hardware monitor chips. It 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. It can even change the FSB on some hardware. At the lowest level, it is a hardware monitor software, but its main feature is that it can control fan speeds according to the temperatures inside your pc, thus reducing noise and power consumption.

What's New in version 4.39:

• added full support for Fintek F71889F, even at unusual addresses
• added support for a new method to access SMART data
• added support for SCSI and SAT hard disk SMART access
• added full support for SuperMicro PWS-865-PQ PSU
• added full support for Winbond W83795G
• added full support for SMSC EMC1402
• added SHORT and EXTENDED OFF-LINE SMART TEST in SMART tab. This feature works on a number of supported interfaces and not on all of them
• added voltage readings for Winbond W83793G
• properly read Tjmax on Core i7 based Xeons
• relabeled IT8512F to IT8512E
• the tray hint is no longer updated if ShowStaticIcon is true
• the tray icon tooltip layout is now vertical
• added Fintek F72569DG detection