Controlling fan speed

marcelinobbq · Dec 4, 2017

So i bought this cable http:// and i connected it to my Mobos cpu fan slot. then i connected cpu fan and my 4 pin corsair Ml120 case fan to the Header. My mobo won´t recognize corsair case fan, and the case fan seems to work together with my cpu fan. Every time cpu fan spins faster, also my case fan spins faster. Is there a way to separate the controls? My mobo is Asus Prime B350m-a

DRagor · Dec 4, 2017

Nope. All fans connected to splitter will run with same speed (proportional to maximum speed, so if CPU fan runs at 50% maximum, so does the case fan).

scout_03 · Dec 4, 2017

leave the cpu fan header to it'own connector and plug this cable the the other fans header for case fans but they will all work at same speed since it have only one sensor on it .

marcelinobbq · Dec 4, 2017

is there a danger of damaging cpu header?

scout_03 · Dec 4, 2017

yes since you ask to much from it for power .

marcelinobbq · Dec 4, 2017

good to know, so i´ll just connect the header to chassis fan connector?

scout_03 · Dec 4, 2017

yes and all your case fans will have the same speed and wont interfer with cpu fan cooler .

DRagor · Dec 4, 2017

How many case fans you have? If only one, why you even decided to connect it together with cooler?

marcelinobbq · Dec 4, 2017

i have 5 case fans and my mobo only has 2 connections.. 1 for chassis fan and one for cpu fan.

scout_03 · Dec 4, 2017

your best option for all those fan would be to have a fan controller to avoid oveload the fans header on the board they could only support a max of power draw like 2 fans max 3 .

DRagor · Dec 4, 2017

Each of those fans needs 0.225 A, so five of them takes over 1 A. Not counting CPU cooler fan. I'm surprised it even worked at all, as CPU_FAN header in Asus boards has 1 A max limit.

marcelinobbq · Dec 4, 2017

i only have 1 corsair ML120 and cpu fan connected to cpu fan header. because those have 4 pin connections. other 3 case fans have 3 pin connections and they get power from PSU. Edit: Actually it seems that the Akasa cable i bought gets power from PSU and only controls speed from mobo. in that case is it safe to use Cpu header?

DRagor · Dec 4, 2017

In that case, yes it is safe. But makes no sense at all. Connect cooler to CPU_FAN, ML120 to the case fan header and keep the other fans as they are. You don't need that splitter.

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