Not well. You cannot plug a 4 pin pwm fan into a 3 pin fan header - will not run. For the fans you want to use, it really won't be a big deal since you'll still be able to control them in the BIOS or with the Asus Fan Xpert. The image below displaying is the difference between a 4 Pin PWM fan connector (Left) and a 3 Pin fan connector (Right) Other thoughts, you can plug a 3 pin fan into a 4 pin motherboard header. PWM fans are DC fans with an extra wire for PWM. The other 3 fans were 4 pin Phanteks 140mm fans. Six of these fans clocks in at about a third the cost of six nearly identical fans from Corsair. And I have to say, I am just blown away by how good these fans are. Note: you will not be able to enable PWM for DC fans. Long answer: OK so I built a huge 15 fan monster with the Enthoo Primo case a few years ago and all 6 of my fans were 3 pin only. Tested, working. Warranty. Yes, the 4-pin fans have a PWM input, which can be driven from an Arduino using a small signal NPN transistor, a small signal N-channel mosfet, or even just a diode. A 4 pin PWM fan connector will have four square holes on the front and four wires entering the back. High-end motherboards offer 4-6 or even more of these 4-pin fan/pump connectors, and the PWM system is a very effective and smart way to control the fans. Works with all PWM fans guaranteed (yes, even Noctua, please disregard the inaccurate reviews) 4 pin PWM to 3 pin standard fan adapter (4 Pack) Connect 4pin pwm fans to a standard 3 pin fan adapter / header Color: Black Length: 4 inches Note: When in use PWM function will cease to operate and fan … Any logic-level n-channel mosfet capable of a few amps will work fine. However, even today, many years after the introduction of PWM in 2003, there are users that are still not familiar with its advantages. DC Fans are 3-pin/3-wire and have power, ground, and tachometric signals. There isn't much difference between them with modern boards. It’s one of the best and the most compact fan controllers to offer. So you basically have the right idea but I just wanted to let you know about some of the less common options out there. The 4-pin PWM version supports fully automatic speed control via PWM fan headers and comes with a Low-Noise Adaptor to reduce the maximum speed from 2000 to 1700rpm. 6x Gentle Typhoons and 6x Corsair SP120's were PWM. If you only have 3-pins, then you should get DC fans. It's around 1.8W during the pulses with a ~7W power spike at the edges. A four pin connector is a little different than the three pin connector since it has the extra (fourth) wire used for controlling and sending signals to the fan, which likely has a chip on it that tells it to slow down or speed up (in addition to the other wires the three pin connector has). I finally replaced my CPU fan from a 3 pin to a 4 pin connector to hear the difference in sound. Bipolar PWM 3-Pin Fan … However, all the CHS_1/2/3/4, etc... fan headers are just voltage control only despite looking like a 4-pin PWM header. 99 Three Wire and Four Wire Fan Connectors PWM fans are 4-pin fans, where the fourth wire sends a PWM signal to the fan motor. 1. Controlling the fan was seemingly straightforward. This is 5.15v and 1.2ma. Where-as PWM fans are 4-pin/4-wire, with the 4th wire being for PWM. With most Asus Z77 boards, the CPU and CPU_OPT fan headers are indeed PWM. DC fans are supplied with DC power from regulated DC supply or motherboard header pins. Enjoy. The 4-pin cooling fan is based on the 3 pin and has a PWM line (pulse width modulation). The PWM frequency is supposed to be 25KHz, which can be generated from timer 1 or 2 on a Uno if you don't need to use the other PWM pin on the same timer for PWM. Great 4 Pin Fan Controller Form Noctua. Short Answer: Get the Phobya or Swiftech hub if you need 3 and 4 pin PWM control at the same time. In order to make use of a fan with PWM, your motherboard needs a PWM header as well as software to interpret the digital signal. upHere Long Life 120mm PWM 4-Pin High Airflow Quiet Edition Rainbow LED Case Fan for PC Cases, CPU Coolers, and Radiators 3-Pack,(PF120CF4-3) 4.4 out of 5 stars 1,325 $18.99 $ 18 . A question came up on IRC regarding how to PWM a 3-pin PC fan with an Arduino using analogWrite(). Here's the improved mosfet version of the 4pin pwm to 3pin fan circuit. The new redeveloped blades in PH-F140XP are angled lower to achieve higher air pressure. They have separate cables for each fan for 4 pin PWM speed-control, and for 3 pin aRGB connectivity. The MB's I've worked with like to have all 3-pin (voltage control) or all 4-pin (PWM control) fans. The so-called PWM line uses the PWM mechanism to adjust the fan speed, and the fan voltage is constant, avoiding the control voltage to shift.