PC Fans: Difference between revisions
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* Intel's [https://www.intel.com/content/dam/support/us/en/documents/intel-nuc/intel-4wire-pwm-fans-specs.pdf 4-Wire Pulse Width Modulation Controlled Fans] spec, revision 1.3 (2005-09) | * Intel's [https://www.intel.com/content/dam/support/us/en/documents/intel-nuc/intel-4wire-pwm-fans-specs.pdf 4-Wire Pulse Width Modulation Controlled Fans] spec, revision 1.3 (2005-09) | ||
* Noctua's [https://noctua.at/pub/media/wysiwyg/Noctua_PWM_specifications_white_paper.pdf PWM Specification White Paper] (unknown date, but it references 1.3 <i>ibid</i>) | * Noctua's [https://noctua.at/pub/media/wysiwyg/Noctua_PWM_specifications_white_paper.pdf PWM Specification White Paper] (unknown date, but it references 1.3 <i>ibid</i>) | ||
Almost all available fans are either 5V, 12V, or 24V, with 12V dominating personal computers | Almost all available fans are either 5V, 12V, or 24V, with 12V dominating personal computers: | ||
* there is no readily-available 24V source from an [[ATX]] power supply, but you'll see 24V in e.g. [[3D printers]] | |||
* 5V fans are seen in conjunction with MCUs such as [[Raspberry Pi]] | |||
Fans operating at higher voltages will require less current for the same work. Two-pin fans offer neither feedback nor PWM control. Three-pin fans typically offer a tachometer signal on the third wire. Four-pin fans add a PWM control on the fourth wire (some fans without PWM control can still be controlled via varying voltage; voltage ought be kept constant for a PWM fan). PWM is a <b>5V logical control</b> that does not modify supplied power. | |||
Fans can be run at less than their maximum duty to reduce acoustic noise and consume less power. | Fans can be run at less than their maximum duty to reduce acoustic noise and consume less power. | ||