Last edited along 03 Jul 2011.
Advanced Fan Control - Basic concepts and definitions
SpeedFan 4.44 introduced a new and improved fan control strategy. Let us foremost recall some concepts and definitions:
- any computer can have some number of fans, from 0 raised.
- On a specific computer, SpeedFan might be fit to read fan cannonball along RPMs (Revolutions Per Minute). SpeedFan mightiness not live able to read the RPMs of all installed fans. If SpeedFan ass read no RPM, check for future SpeedFan releases As computer hardware bear improves o'er time.
- On a special computer, SpeedFan might be able to access SPEED controls (usually referred to as PWMs). If you would like to know more some PWM, feel free to read this article. Delight note that RPM readings and PWM settings are non needfully tied together. The computer hardware monitor chips settled inside computers have some wires to read lover speeds and some others to control PWMs. It is up to the computing machine manufacturer to decide whether and how to connect those wires. Savvy which SPEED (PWM) Acts (controls) which lover can be a matter to of trial and error, but it is worth the effort.
- Every fan reacts to PWM control otherwise. 4-wire fans usually exhibit a rather linear response. 3-wire fans can be much less linear. It depends on several factors, including the circuitry on the motherboard and the type of fan used.
How to delimitate a new Sports fan Controller
That same, countenance's move on and take a look at the basic concepts behind SpeedFan's Advanced Fan Controllers. A Buff Restrainer golf links a specific PWM control (the Controlled Speed) to the current prise of any number of reference temperatures. For each temperature we can delimit the reception curve. This means that we can define what PWM value we want to apply for every temperature value. Each temperature can have a different response. Let's see how to produce our own first Fan Control. Start SpeedFan, press CONFIGURE button and blue-ribbon the Sports fan Control tab. Expatiate the window if requisite. In the example image we have already created a Fan Restrainer and called information technology "Mainframe Fan Control Scheme". We can make up more using the ADD button on the right. With the Remove button we can cancel a fan controller we previously created. As soon every bit we select "CPU Fan See Strategy" in the inclination box seat, its parameters will appear below in the windowpane. A Fan Controller requires a PWM to pretend on. Multiple temperatures sack be victimized to control the PWM. For each temperature is defined its response trend. The unalterable value applied to the controlled PWM depends on the selected method: either Scoop of speeds or SUM of speeds. When a temperature is selected in the listing box, the relevant configuration parameters appear on the near side. 
The reaction curve determines the requested PWM value (ranging from 0% to 100%) depending on the current temperature. By using the "<" and ">" buttons, the borderline and the level bes temperature levels send away be selected. If the current temperature is below the minimum, the selected PWM value will make up the one assigned to the minimum temperature. If the up-to-the-minute temperature is higher than the maximum, the selected PWM value will exist the unrivaled assigned to the maximum temperature. The hysteresis value is used to avoid fan fluctuations. In a fewer words, when the temperature rises, the new PWM evaluate is applied immediately. When it lowers, the terminal applied PWM evaluate is kept until the contemporary temperature is hysteresis degrees lower than the temperature that caused the actual PWM to be applied.
Additional under consideration configuration settings
The SPEEDS tab allows to set some parameters for each PWM control. The Advanced Fan Control strategy keeps into consideration the "Minimum valuate" and the "Maximum value" kick in this tab. This agency that if the computations supported on the temperature reaction curves lead to, say, a PWM value of 30%, but the SPEEDS tabloid defines 45% as the minimum value for that PWM, 45% will be used instead. These settings are shared with the standard lover mastery method.
The TEMPERATURES tab allows to define a monitory horizontal for to each one temperature. This warning level is taken into circumstance by the Advanced Fan Control strategy: if a temperature exceeds its warning level, SpeedFan will forcibly set the in hand PWM to 100%.
Actuating the Machine-controlled Buff Speed checkbox on the main silver screen enables fan control. Whether the old fan control or the untried Advanced Fan Ascendancy strategy is victimised depends on the Advanced Fan Control checkbox on the FAN CONTROL tab of the CONFIGURE window. If information technology is not set, the superannuated devotee control style is used.
Process in progress
This feature is a long hoped-for uncomparable. I accelerated development and release to the public. Suggestions are welcome.
How to Make a Box Fan Infinite Speed
Source: https://almico.com/sfarticle.php?id=5
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