In manual mode, I can set parameters for the fans to operate at different speeds depending on the temperature of the chassis and/or CPU. The MB BIOS has 3 preconfigured profiles that someone could apply to the fans, Standard, Silent, Turbo, and then it has a Manual mode. Since I'm also using a Corsair H100i push/pull system using 2 fan splitters (2-120mm fans on each side) add an additional 2 fans. Then my MB has a 4 pin CPU fan, a 4 pin CPU_OPT fan, 4 pin CHA fans 1, 2, & 3, and 4 pin CHA_OPT fans 1, 2, & 3. My case has a 200mm top fan that looks like is manually controlled. On some motherboards, some headers aren't capable of any kind of speed regulation. I guess the extra pin there is just so you don't have part of the connector dangling on to nothing if you're using a 4-pin fan. Take it on a case-by-case basis.Īlso note that 4-pin fan headers on motherboards may not be actually capable of sending PWM signals, even the ones that you can still control via #1. As for which is better, some fans respond in different ways. However, fans capable of PWM control can certainly be controlled via #1. PWM fans have a fourth pin for a PWM signal to direct how #2 should be done. Pulse that 12V on and off (very rapidly) so part of the time it's running 12V and part of the time it's running 0V.Īll fans can be controlled via #1.Note that depending on the design of the fan, it may not spin up with only 5V or 6V or 8V or whatever. Lower that 12V down to a lower voltage like 6V.Also, it could be used if that's more convenient for wiring or if a fan takes so much power, the motherboard header couldn't handle it.Ĭomputer fans run on nominal 12V and thus there are two ways to control the power delivered and thus the speed of them. It's kind of a last resort because you don't get fan speed monitoring or control. The 4-pin "molex" is an alternative for powering the fans if you don't have any proper 3-pin or 4-pin fan headers left. Can someone please give me an explanation of the differences and if the fans still require the use of a MOLEX connector? Thanks. Since the 3 pin fans that came with my case are setup and are obviously running, is a MOLEX connector necessary? And what benefit are 4 pin fans going to give me over the 3 pin fans? I thought the 4th pin gives you the ability to control the fans individually, but I can do that now with the 3 pin fans through the ASUS BIOS and the fan controller software. What's the benefit of having a fan with a 4 pin connector vs a 3 pin connector? Also, I see where some fans, when bought individually, may have a MOLEX connector on them as well, which I assume is to provide power to the fans. All the fans the came on my case are 3 pin fans, which are also designed to fit the 4 pin connectors. All the fans can be controlled through the BIOS. My MB, an ASUS Maximus VI Formula ROG with the built-in armor, has 4 pin fan connectors. Ok, this may sound like a dumb question, but it's something I need to know before ordering new fans.
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