![]() Since they must move more air through the same area of space, fans will become more noisy.įans installed in a PC case can produce noise levels of up to 70 dB. The byproduct of increased heat generation is that the fan(s) need to move increasing amounts of air and thus need to be more powerful. Power supplies needed forced cooling, and power supply fans also circulated cooling air through the rest of the PC with the ATX standard. Processors in most early x86-based computers, up to some of the early 486s, did not need active ventilation. Heat production varies with system load, where periods of compute-intensive activity generate much more heat than the idle time does. Computers emit this electrical power as heat generated by all major components. Need for fan control Īs modern PCs grow more powerful so do their requirements for electrical power. This is commonly accomplished by the motherboards having hardware monitoring circuitry, which can be configured by the end-user through BIOS or other software to perform fan control. In computers, various types of computer fans are used to provide adequate cooling, and different fan control mechanisms balance their cooling capacities and noise they generate. At the top of the case is a fan controller.įan control is the management of the rotational speed of an electric fan. They were pretty good about using the best methods for cross compatability.Management of the rotational speed of a computer fan Full-tower computer cases may contain multiple cooling fans. ![]() Either fan can be voltage controlled, a PWM fan though has additional capability to be PWM controlled. A 4pin fan can also be put on a 3 pin header, and the voltage and rpm will still be correct. A 3 pin fan connection lines up on the 4 pin header just fine, and provided the voltage and rpm readings. Some fans and cooler items come with an array of connections, for connecting more than one way. In most of the chassis connections you can also use a 4pin pwm fan, it just is not likely to be needed/expected like it is for the cpu fan items. So in the case of most of these cpu fans, you really prefer and many good coolers come with a 4pin connection and a real pwm operational fan. ![]() They will still work with a PWM 4pin fan or a 3pin fan, either will be in a voltage control mode (not actual PWM). Because good pwm 4 pin fans even with quality parts are inexpencive, and because it will work the way it is, there is no problem using what you have, then upgrading it with a 4pin actual PWM fan when needed/desired.Ĭhassis (case not cpu) fan headers come in 3& 4 pin, but many (most but not all) of the motherboards do not use actual PWM for these "other" connections, so control of them does not "require" a 4 pin PWM fan because they will be voltage controlled anyway. It is true that a 4pin actual PWM connection running PWM (because sometimes you can switch in the MB bios/uefi to voltage control) will not fully control a 3Pin fan which has no PWM capability connected, YES. Because the method of control is via PWM, the feed voltage is the same, so a 3pin fan will run at full speed. Generally speaking todays motherboards have 2 of the PWM headers for the CPU and any secondary cpu fan item (cpu-opt), these 2 connections are best used with PWM actual fans with 4 pin connections.
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