PWM Fan Hub with 4pin fans

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tuukkapalovaara

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Feb 1, 2016
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I just bought 4 Cryorig qf120 balance fans that are PWM fans and have a 4pin header (If I have understood correctly). I was wondering what would happen if I connected those fans to Phanteks PWM Fan hub and then connected the fan hub to my mobo. Would the mobo still be able to control those fans or would they just spin at 100% all the time?
 
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tuukkapalovaara

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Feb 1, 2016
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Yeah I guess. The mobo is ga970a-ud3p so it should have atleast one pwm fan slot
 
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photonboy

photonboy

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Jun 20, 2006
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They are definitely controlled by the 4-pin, PWM fan header on the motherboard.

Those fans go from 600RPM to 2200RPM, however you may find that going beyond 800RPM may not make much difference to cooling.

(Update: I think most boards offer down to 40% for case fan headers and 20% for the CPU. Thus, if using the case fan which is likely unless using push/pull rad setup for CPU then you probably can't go much below 900RPM since you take 40% of the max RPM)

*You will have to setup the motherboard fan control properly. I'm not sure what motherboard you have, but in MY case:
a) BIOS offered a basic mode, but wasn't fully configurable, and

b) My older Asus board had great software, however I had to use Windows 7 software as nothing was listed at the support site for W8 or W10 (there was software listed, just not anything for the fan).

c) Z77 Sabertooth had PWM and Voltage for case fans, but only PWM for the CPU (later boards seemed to bring back full PWM/Voltage for all but I can't be certain... I think Voltage control for 3-pin fans got dropped and then caused too many issues since CPU coolers still have 3-pin voltage control)

Recommended scenarios?
With only one fan header you'll be using the same temperature sensor for all fans (so maybe control 2xinput 1xtop/top exhaust, and 1xtop/rear exhaust?

Probably doesn't matter much overall, so pick one such as perhaps the main chipset sensor or one near your graphics card and perhaps do something like 600RPM at 40degC-> 800RPM at 50degC. you'll have to experiment but don't have them making a lot of noise if you get only 2degC reduction.

 
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tuukkapalovaara

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Feb 1, 2016
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Thanks for your advice and sorry for the accidental downvote! I've bought those balanced versions and I will be using them with two 240mm thin rads. Do you have any suggestions what would be the best solution for running those fans? Would it be the fan hub or something else?
 
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photonboy

photonboy

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Jun 20, 2006
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I'd only use the hub if you can't do what you want from the motherboard. I assume one radiator is for the CPU, and I guess the other one is for a GPU loop?

Or do you have one single combined loop?

If it's one single loop then I guess it makes sense to run all the fans at the same speed, but if separate then it would be best to have the CPU temperature sensor and CPU rad fans optimized together and same for the other radiator.

Other options include a simple 4-pin Y-splitter to run two fans from the same header.

Other:
No worries about the down vote. I never cared and as well had to see a doctor today (don't ask) so I have much bigger concerns than that. Good luck on your PC.

I did get a recent e-mail from Toms Hardware thanking me for all my help though so that was nice.
 
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