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Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Yes—when a case fan is plugged directly into a motherboard fan header, that header supplies its electrical power. A fan connected to a separately powered hub may instead draw operating power from the power supply, while the motherboard connection carries speed-control signals and may provide an RPM reading. Which arrangement applies depends on the fan, hub, and motherboard.
How a direct motherboard connection works
A case fan connected to a system-fan header—often labeled SYS_FAN, CHA_FAN, or something similar—gets power through that header. The motherboard can also control fan speed and read the fan’s RPM, if the header and fan support those functions.
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Three-pin and four-pin plugs use different speed-control methods. A compatible motherboard may control a three-pin fan by varying the supplied voltage; a four-pin fan adds a PWM control signal. The available modes and settings depend on the specific header and motherboard. GIGABYTE’s Q670M D3H DDR4 manual, for example, identifies ground, voltage speed control, sense, and PWM speed control pins on its four-pin fan headers: GIGABYTE Q670M D3H DDR4 manual.
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Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Outbyte Driver Updater FREEScan for outdated or missing drivers - takes under a minuteDriver Scan →How a powered fan hub differs
A hub can separate the fan’s power source from its control connection. In Phanteks’ Enthoo Elite instructions, the hub connects to PSU SATA power and to a motherboard fan header with a four-pin cable. In that specific setup, Fan 1 provides the RPM signal used by the hub. The PSU supplies operating power; the motherboard connection handles control and RPM reporting as described by the hub’s design. See the Phanteks Enthoo Elite installation instructions.
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- Length 240mm, pack of two computer fan splitter cables
- One-to-two PWM fan splitter
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- Supports 2 PWM fans from a single motherboard PWM header
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That wiring is an example, not a rule for every hub. Read the hub manual to identify its PSU power input, required motherboard connection, compatible fan types, and which port—if any—reports RPM. Trace both cables rather than assuming that a motherboard lead is supplying the fans’ full operating power.
What changes when you use a splitter?
A splitter lets multiple fans share one motherboard header, so the fans draw power through that header. Its electrical limit still applies: add the connected fans’ current draw and compare the total with the rating for the exact header on your motherboard. There is no universal safe number of fans per header because ratings vary by board and header.
Rank #2
- Triple Fan Connection Solution: The 4 pin fan splitter cable connects up to 3 computer case fans to a single motherboard fan header. This PWM splitter cable lets you add an additional fan to improve airflow inside your PC. A fan speed label on the 4 pin master connector of the fan header splitter is wired to receive the PWM control signal and distribute it to all slave fans for synchronized cooling.
- Unified PWM Control: The 3 way fan splitter (also known as a motherboard fan splitter, CPU fan splitter, or PC fan splitter 4 pin) connects to a 4-pin motherboard header and splits the signal across 3 PWM fans. Control fan speed uniformly through motherboard software for efficient, balanced cooling performance.
- Synchronized Speed Management: The 4pin fan splitter features one 4-pin connector that sends the RPM signal back to the motherboard to synchronize fan speed across the other two fans. The 3 pin fan splitter omits the RPM signal pin, allowing all connected fans to run in tandem when supported by your system—perfect for setups where you need to daisy chain PC fans for optimized airflow.
- Spare Cable Convenience Pack: This cost-effective 2-pack of computer fan splitter 4 pin cables includes a spare for future upgrades or extra fans. Each sleeved and wrapped black 12-inch case fan splitter cable provides a clean, professional look inside an open PC case and helps organize your cable management.
- Wide Compatibility for Enhanced Cooling: Compatible with both 3-pin and 4-pin fans, this PWM fan splitter cable works with popular models such as the Cooler Master Hyper 212 EVO 120mm, Cooler Master MegaFlow 200mm, and other large 230mm case fans. Easily expand your system’s cooling capacity with this reliable PWM fan splitter cable.
ASUS advises connecting a splitter to its primary header and notes that fan speed is synchronized with the RPM of the first fan. That guidance describes the splitter arrangement in ASUS’s computer-chassis fan-cable guidance; check your own board and splitter documentation before applying it. MSI likewise explains that ratings can differ among header categories and motherboard models in its motherboard ports and headers guide.
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How to identify the right connection
- Find the exact motherboard model. Use its manual to locate system or chassis fan headers, their current limits, and supported DC or PWM control modes. Header names and locations differ across boards.
- Identify the fan’s motor plug. Match its three-pin or four-pin connector to a fan header or hub port, and check the motherboard or hub instructions for supported control options.
- Keep lighting cables separate. RGB or ARGB plugs power or control lighting, not the fan motor. Confirm labels and pin layouts in the relevant manuals before connecting them.
- If using a hub, trace both paths. Check which cable connects to the PSU and which connects to the motherboard, then follow the hub’s directions for control and RPM reporting.
- If using a splitter, check the load. Verify the total fan current against the specific motherboard header rating and follow the splitter instructions.
Keep the CPU cooler connection distinct
Do not confuse a case-fan header with the dedicated CPU_FAN connection used for a CPU cooler. MSI describes CPU_FAN and system-fan headers as separate connection types in its motherboard header guide. Follow your motherboard’s manual for the CPU cooler and case fans rather than treating all fan headers as interchangeable.
Quick Recap
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- Efficient and Convenient: The 3 Way PC Fan Splitter is designed to efficiently distribute power to multiple fans, allowing for optimal cooling performance in your computer. With 2 Pcs of 4 Pin PWM Fan Splitters, this splitter provides a convenient solution for connecting and controlling multiple fans at once
- Versatile Compatibility: This Fan Header Splitter is compatible with both 4-pin and 3-pin cooling fans, making it suitable for various types of computer cases. Whether you have a high-performance gaming rig or a compact workstation, this splitter will ensure efficient airflow and temperature regulation
- Simplified Cable Management: Say goodbye to messy cables! The PC Fan Splitter 1 to 3 Converter simplifies cable management by consolidating multiple fan connections into a single cable. This not only improves the overall aesthetics of your computer but also minimizes the risk of cable tangling and obstruction
- Durable Construction: Constructed with high-quality materials, this Case Fan Splitter is built to withstand the demands of continuous usage. The 11-inch length provides ample reach and flexibility, allowing you to easily connect fans in different locations within your computer case
- Made of PVC Braided Rope and Stylish Design: Made of PVC braided rope black finish, this fan splitter seamlessly blends in with any computer setup. Its compact design ensures compatibility with various PC cases, while the durable connectors ensure a secure and reliable connection
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- Triple Your Cooling: Connect up to three 4-pin or 3-pin PWM case fans to a single motherboard fan header. Easily add extra fans to dramatically improve PC airflow and cooling performance for your CPU, GPU, or entire system.
- Unified PWM Control: This 3-way splitter features one master connector (with RPM sensing) and two follower connectors. It distributes a single PWM speed control signal from your motherboard BIOS or software for synchronized, uniform fan speed management across all connected fans.
- Ideal Length & 2-Pack Value: Each sleeved black cable is 10.6 inches (27 cm) long, providing ample reach for clean, organized cable management inside your PC case. The cost-effective 2-pack includes a spare for future upgrades or additional cooling setups.
- Wide Compatibility: Works seamlessly with both 4-pin PWM and 3-pin DC fans. Compatible with popular fan models from Cooler Master including large 200mm or 230mm case fans.
- Safe & Reliable Design: Built with quality materials to ensure stable power delivery and signal integrity. The splitter safely draws power directly from the PSU via the motherboard header, preventing overloading while enabling efficient, balanced cooling for your gaming rig or workstation.
Rank #3
- Dual Fan Connection: This PC fan splitter Y cable connects 2 computer case fans to a single motherboard fan header. This 1 to 2 case fan splitter is ideal for adding an extra fan to boost airflow inside your computer case.
- 4-Pin Fan Header Support: Mobo 4 pin fan splitter connects to the 4-pin header on your motherboard and splits the PWM signal to 2 PWM fans. Both fans can spin at the same speed using motherboard software with PWM control support.
- Sync for Consistent Speeds: Master/slave PWM splitter includes a 4 pin fan connector that transmits the RPM signal to the motherboard, ensuring synchronized fan speeds for both fans. The computer fan splitter omits the RPM signal pin on the second fan for tandem operation.
- Tidy Setup with PWM Y Cable: Double CPU fan splitter supports up to 4 fans using this cost-effective 2-pack of fan header splitter cables. The black-sleeved and wrapped 4-inch PWM Y splitter cable ensures a clean and organized build—perfect for open computer cases.
- Works with 3-Pin & 4-Pin Case Fans: 3-pin & 4-pin fan compatible with popular cooling fans such as Corsair Air Series AF120 80mm / AF140 High Airflow, Cooler Master Blade Master 80 / Master 92, Cooler Master Hyper 212 EVO 120mm, JetFlo 120mm, SickleFlow 120mm, MegaFlow 200mm, Noctua NF-F12, and Thermaltake WATER 3.0 Dual 240.
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