![]() * almost any number of fan speed readings * almost any number of temperature readings * almost any number of hardware monitor chips On my system, TEMP1 and TEMP3 are both influenced by FAN1. You can configure on which fan every temperature should rely. In my pc, more than one temperature changes when a fan runs faster. One last word should be said regarding the USE FAN x listbox. Consider that when the WARNING temperature is reached, the program sets the fan speed to 100, whatever maximum speed you selected. You can set, say, 60 as the maximum value and, sometimes, I myself set it that way. I suggest to use 100 as the maximum value, unless you hear a lot of noise from it, in which case you might reduce the maximum speed to 95 or 90. ![]() When you hear no noise from the fan then you can set that value as the minimum fan speed for that fan. When choosing parameters for the minimum and maximum fan speed, try to set them by hand (disable all the VARIATE FANs checkboxes) and listen to the noise. By properly configuring SpeedFan, you can let it change fan speeds based on system temperatures. SpeedFan monitor temperatures from several sources. PWM4 and PWM5 on ITE IT8620E are now disabled by default (please, read this article). ITE IT8620E (used on several Gigabyte boards) support has been greatly enhanced (now SpeedFan can control up to 5 fans and report voltages too). This version defaults to no SCSI access if the Intel Storage Driver is found. SpeedFan 4.51 Final is now online! It adds support for a lot of new hardware. ![]() SpeedFan works fine with Windows 9x, ME, NT, 2000, 2003, XP, Vista, Windows 7, 2008, Windows 8 and Windows Server 2012. SpeedFan can access digital temperature sensors and can change fan speeds accordingly, thus reducing noise. SpeedFan can even change the FSB on some hardware (but this should be considered a bonus feature). SpeedFan can find almost any hardware monitor chip connected to the 2-wire SMBus Serial Interface and to the ISA BUS.SpeedFan is a program that monitors voltages, fan speeds and temperatures in computers with hardware monitor chips. The most used are National PC87366 and all of SMSC LPC SuperIO chips. SpeedFan can automatically detect them and use their features. Some SuperIO chips include temperature sensors too. Winbond W83697HF, Analog Devices ADT7463, SMSC EMC6D102, ITE IT8712F, National LM85C and Maxim MAX6650 are very good candidates. If your BIOS was programmed to setup such chips this way you can still try to use SpeedFan's Advanced Configuration to revert to manual (software controlled) mode. Some chips can even be programmed to vary fan speeds without any additional software intervention. From one of the very first hardware monitor chips that could be found in standard PCs, the National Semiconductor LM75 (and all of its clones, like the Philips NE1617 and the Philips NE1618 or the Maxim MAX1617) or the Analog Devices ADM1021, such chips have been greatly improved, both in their precision and in their capabilities.Ĭurrent chips can monitor fan speeds, voltages and control fan speeds by using PWMs (Pulse Width Modulation). Several sensors, like Winbond's and the AS99127F support fan speed changing, as well as others from Maxim, Myson, Analog Devices, National Semiconductor and ITE, but the hardware manufacturer must have connected the relevant pins to some additional, yet trivial, circuitry. SpeedFan can change the FSB on some hardware (but this should be considered a bonus feature). SpeedFan works with Windows 9x, ME, NT, 2000, 2003, XP, Vista, Windows 7, 2008, Windows 8, Windows 10, Windows 11 and Windows Server 2012. What operating systems are compatible with SpeedFan? SpeedFan can also read S.M.A.R.T information from your hard drives, show CPU usage, chipset information, core temperatures, change clock speed, and analyze voltages. What other features does SpeedFan offer besides controlling fan speed? Once installed, SpeedFan will automatically detect if your hardware is compatible and advanced features are presented. SpeedFan is able to control the fan speed of most fan makes and models, but this will ultimately depend on your motherboard's sensor chip and capabilities. Can SpeedFan control the fan speed of any fan? SpeedFan is a hardware monitor software that can access temperature sensors, but its main feature is that it can control fan speeds – depending on the capabilities of your sensor chip and your hardware – according to the temperatures inside your PC, thus reducing noise and power consumption.
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