The Hub will have ONE of its outputs identified as the ONLY one whose speed is sent to the mobo, so be sure that one of your fans is plugged into that port. So any Splitter OR Hub will send back the speed signal from only ONE of its fans and ignore all the others. To work, the Hub MUST receive the PWM signal from the mobo header, so make sure the header you use is set to use the PWM Mode for control, and not the older DC Mode.Īny mobo header can handle the speed signal fed back to it from only ONE fan. This can supply much more power than a mobo fan header can, so a Hub does not overload the header and can handle more than 3 or 4 fans. But it gets the POWER for those fans directly from the PSU via a cable that must plug into a PSU power output connector - in both of those examples, a SATA power output. It gets its fan speed control signal from one mobo header and distributes that to all its connected fans. A HUB does it differently and really only works with 4-pin fan systems, which IS what you have planned. So you are right - you'd need two Splitters to use three fans per header. A header can provide up to 1.0 A max current to its load, and three such fans fits within that easily, but not six. With a SPLITTER all its attached fans (you suggested ones with 3 outputs each) are connected in parallel to the mobo header outputs and they draw all the fan motor power from that header. Splitters and Hubs are different devices.
Here are two examples at $15, versus those Splitters at $7 each. Since you'd prefer to use only one of your mobo's CHA_FAN headers to control six 4-pin fans, I suggest you get a HUB instead of a Splitter.
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