Problem with Phanteks PWM Fan Hub.

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Acousticalities

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Dec 11, 2016
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Hello everyone,

So I am building a new gaming rig right now using the new Phanteks Enthoo Evolv tempered glass case. This case comes factory equipped with a Phanteks PWM Fan hub which all the stock fans are hooked by default.

The following components are being used along with aforementioned case:

MOBO: Asus ROG Maximus VIII Hero
CPU: Intel i7-6700k
CPU Cooler: Corsair H80i v2
GPU: Asus ROG Strix Geforce 1080 08G
PSU: EVGA Supernova 850 P2 Gold certified
RAM: 32 Gb G.Skill TridentZ 3200 MHz

I originally tried what Phanteks recommended by connecting the 3-pin fan hub into the CPU_FAN outlet in the MOBO, I then connected the CPU cooler to the fan hub. Unfortunately, on first boot that resulted in a error message on screen stating that No CPU_FAN connection was detected.

The ASUS Maximus VIII Hero Motherboard is unique in that it states that all the fan outputs on the motherboard are PWM-capable. So I then unhooked the PWM Hub from the CPU_FAN outlet, and hooked the water cooler directly to that. I then hooked the PWM Fan hub up to the next outlet on the motherboard that was accessible CPU_OPT which is also a 4-pin connector on the MOBO.

On second start up, the error about CPU_FAN was now gone, but all the case fans are now running at very high speeds non-stop.

Does anyone have recommendations on how to fix this?

Thanks.

 
Solution
Lutfij
Out of curiosity, did you also connect the H80i to the Fan hub while taking note of the placement where the pins on the PWM hub are actually sending signals back to the board for regulating? Out of a fan hub, only one will send signals back to the board and as such is indicated as to which one out of the hub needs a true PWM fan attached.

According to your manual(page 27) that one fan header is Fan 1. The pump's header should go onto CPU_OPT and see is any changes take place.
The PWM hub functions optimally when modulated by a PWM signal from the motherboard, which will allow the greatest control
range. However, not all 4-pin motherboard connectors implement true PWM signal modulation.

Connecting the 4-pin to CPU_FAN...
Click to expand...
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Lutfij

Lutfij

Titan
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Oct 7, 2009
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Out of curiosity, did you also connect the H80i to the Fan hub while taking note of the placement where the pins on the PWM hub are actually sending signals back to the board for regulating? Out of a fan hub, only one will send signals back to the board and as such is indicated as to which one out of the hub needs a true PWM fan attached.

According to your manual(page 27) that one fan header is Fan 1. The pump's header should go onto CPU_OPT and see is any changes take place.
The PWM hub functions optimally when modulated by a PWM signal from the motherboard, which will allow the greatest control
range. However, not all 4-pin motherboard connectors implement true PWM signal modulation.

Connecting the 4-pin to CPU_FAN
For full PWM functionality, Phanteks’ PWM hub requires users to connect the 4-pin connector to the “CPU_Fan” connector of the motherboard,
because all motherboard manufacturers implements a PWM signal modulation on this connector. Connect the SATA 12V power to
power the PWM hub. Not all motherboards have their CPU_Fan connector set on PWM signal modulation by default. Please consult
your motherboard documentation for this matter.

Connecting the 4-pin to other 4-pin header (besides the CPU_Fan) Other 4-pin connectors can be found on modern motherboards besides
the “CPU_Fan” connector (e.g. “CPU_Fan2”, “CHA_Fan”, “OPT_Fan”), however not all motherboard manufacturers implement a true PWM
signal modulation onto these connectors. These type of 4-pin connectors modulate the RPM by voltage, which has a smaller control range
compared to modulation by true PWM signal.

The 12V SATA power cable can not be used to power the PWM hub if connecting to these types of 4-pin connectors, due to the interference
with the RPM regulation by voltage (resulting in the fans running on full RPM). The PWM hub will draw its power from the 4-pin connector,
which is limited to a total device consuming 30W in total.

Important Note:
1 motherboard connector can only read 1 RPM signal. Therefore, the motherboard will only read the RPM signal from 1 device connected to Fan 1. Y-splitter should not be connected to FAN 1.
Click to expand...
 
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