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A motherboard can power a fan without being able to regulate its speed. Whether a case fan can be controlled depends on the exact header and its BIOS settings—not just the header label or number of pins. Check the board manual, match the header’s control mode to the fan, then test whether its speed changes.
Why a motherboard may not change a case fan’s speed
Fan headers are not interchangeable in capability. Some support speed control, some offer particular control modes, and some may not support fan control at all. The exact motherboard manual is the authority for each header; pin count or a label such as “CHA_FAN” alone does not establish what it can do. ASRock’s guidance illustrates how capabilities and settings can differ even among headers on a board.
Also distinguish between a fan receiving power and receiving a usable speed-control signal. A fan can spin while remaining at full speed if its header does not support control or if its control mode does not match the fan.
Match the fan connector to the header’s control mode
In common motherboard implementations, 3-pin fans are regulated by changing voltage (DC mode), while 4-pin fans use a PWM control signal. These are common approaches, not a guarantee that every header supports both: confirm the available modes for the specific header in the manual and BIOS.
#1 Best Overall
- CABLE MANAGEMENT: Case Fan Hub can be placed in housing, it's connected to motherboard with one cable, you can do without many additional cables and lay them freely in the invisible part of housing
- SYNCHRONOUS FAN CONTROL: Your set PWM signal is passed on synchronously to all fans connected to the Case Fan Hub, the RPM of the first fan slot are read out and returned to your system
- EXPAND YOUR VENTILATION: Even if you don't have enough fan headers on your mainboard, the case fan hub expands your system by 9 more case fan slots
- EXTERNAL POWER SUPPLY: The fans are powered directly from your power supply via Sata Power, there is no voltage loss at the fan speed and smooth, smooth operation is made possible
- TECHNICAL DETAILS: Output: 10 x 4-pin PWM Socket, Output Current: up to 1 A per Port, Input: SATA Power + 4-pin Fan Header, Input Current: up to 4.5 A, Dimensions: 55.6 x 86.3 x 14.3 mm, Weight: 50 g
| Fan connector | Common control method | What to check |
|---|---|---|
| 3-pin | DC (voltage regulation) | Confirm the header supports DC control and select it if required. |
| 4-pin | PWM | Confirm the header supports PWM and select it if required. |
For example, the ASUS Z97M-PLUS manual says its chassis fan connectors support DC and PWM modes selectable through BIOS Q-Fan settings. That applies to that board, not to every motherboard.
Check the BIOS setting if a fan runs at full speed
- Identify the exact motherboard model. Open its official manual and find the description and power limit for the particular CPU, chassis, system, or pump header in use.
- Check the fan connector. Count its pins: 3-pin fans commonly use DC control, while 4-pin fans commonly use PWM.
- Inspect that header’s BIOS controls. Select DC for a 3-pin fan or PWM for a 4-pin fan only if the header and board support the mode. Menu names and locations vary by model.
- Test the result. Change the fan setting or curve and observe whether the fan speed responds. If it does not, verify that the header supports speed control and that the selected mode matches the fan.
MSI documents one specific full-speed case: a 3-pin CPU fan connected to CPU_FAN1 and configured as PWM. For that setup, MSI’s instructions are to go to BIOS > Hardware Monitor and change “CPU 1” from “PWM” to “DC.” This is a model-specific example, not a universal menu path. See MSI’s FAQ.
Rank #2
- 9-Port ARGB PWM Hub: Supports up to 9 fans with individual PWM speed control and synchronized ARGB lighting. Compatible with 5V 3-pin RGB fans and LED strips for enhanced cooling and aesthetics.
- Magnetic Installation: Strong magnetic backing attaches securely to any metal PC case surface without adhesive tape. Easy repositioning and clean installation.
- SATA Power Supply: Direct SATA power connection prevents voltage loss and ensures stable fan operation. Supports high-power fans without motherboard overload.
- Cable Management: Compact 4.64" x 2.2" x 0.67" design reduces cable clutter and improves airflow inside your case.
- Universal Compatibility: Works with all standard 4-pin PWM fans and 3-pin ARGB devices. Note: Connect 12V 4-pin to motherboard for PWM control; controller manages lighting only.
What splitters do—and do not—control
A splitter lets multiple compatible fans use one motherboard header, but the fans share that header’s control signal. They do not get independent curves through the splitter. Before connecting multiple fans, check the exact header’s documented power limit and add up the fans’ current draw; the motherboard manual determines the applicable limit.
Noctua says its NA-SYC1 PWM splitter cables let two PWM fans share a header and be controlled together, with additional cables daisy-chainable. That does not establish that two fans—or any other particular number—are safe on your header: confirm the combined draw against the board’s limit.
Rank #3
- Supports 6pcs 4 Pin PWM Fans (Fans not included, Not compatible with 3-pin/2-pin fans)
- Flexible Power Supply Input: Compatible with both Type-C 12V (Supports QC3.0 / PD3.0) and DC 5.5×2.1mm (5521) 12V input, allowing flexible power options
- Maximum total power output: 60W (5A@12V), with each port supporting up to 2A current while total combined current shall not exceed 5A
- Adjustable PWM duty cycle: 10 lights represent PWM duty cycle (0-100% in 10% increments), the color of indicator light shows input voltage status. ( Blue light: 12V input normal. Orange light: Input voltage below 11.8V, fan operates at low speed. Red light: Input voltage below 8.4V, your power device unusable.)
- Package include: a 4 Pin 12V PWM Fan Speed Controller ONLY
RPM reporting may also be shared. With Noctua’s NA-SC1 three-way splitter, PWM is forwarded to all outputs, but RPM is returned from only one fan. A single reported RPM reading therefore does not tell you the individual speeds of every fan on the splitter.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.When a separate PWM controller makes sense
A manual PWM controller can provide manual adjustment or modify an incoming motherboard PWM signal. Noctua’s NA-FC1 manual documents both uses, including a SATA-powered configuration. A controller is not the same as adding independent motherboard fan curves: fans grouped on the same control signal still do not become independently controlled by the motherboard.
Rank #4
- Thermalright is a Taiwanese brand with more than 20 years of development. It has a certain popularity in domestic and foreign markets and has a decisive influence in the player market. R & D product lines include: CPU air-cooled radiator, chassis cooling fan, thermal conductive silicone pad, thermal conductive silicone grease, CPU fan controller, anti falling off mounting bracket, support mounting bracket and other commodities.
- Built in strong double-sided sticker, fixed on the chassis with double-sided sticker. SATA power line direct transmission, more concise and more efficient. Maintain stable output under high load.
- Small body, large capacity. Multi line control to keep cables in order.
- This fan hub supports the installation of 10 groups of fans, making it easy to manage wiring. Strong paste installation mode, convenient SATA power line direct transmission, and safety is guaranteed.
- Support fan speed reading. (due to the limitation of PWM mainboard IC reading principle, only the speed of a single fan inserted into the red interface is recognized).
Choose an approach based on whether fans can share one curve, whether they are 3-pin or 4-pin, the controller or splitter’s supported connections, how RPM is reported, and the motherboard header’s power limit versus the combined fan draw.
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Quick Recap
Best Value
- 8-way fan splitter board for powering, controlling and monitoring multiple fans, transmits PWM signal from PC motherboards or optional NA-FC1 fan controller to all connected fans
- 4-pin (for 5V and 12V fans) and S-ATA (for 12V only) inputs can be used simultaneously (power via S-ATA, RPM & PWM via 4-pin), safety fuses provide protection against overcurrent and short-circuits
- Up to 54W total power via S-ATA (12V fans only) and 24W via 4-pin interface, ideal both for 12V PC case fans and 5V applications (with Noctua 5V fans that include USB power adaptor cables)
- Easy installation on any magnetic surface such as steel PC case panels thanks to four strong mag-nets, included NA-EC1 input cable for connection to motherboard fan headers
- Full compliance with all applicable safety standards (EN 62368-1, EN 55035, EN 55032, UL-507), CE, UKCA and UL certification, renowned Noctua quality backed up by a 6 year manufacturer’s warranty
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