How to connect 4 fans to corsair h115i

[Jcooper234234]

I am trying to set up a corsair h115i cooler with 4 fans in push pull. The fans are corsair sp140 LED series, the cooler comes stock with 2 140mm fans which I am replacing and the manual says that the pump connects to the cpu header and the 2 fans then connect to two fan cables coming from the pump. The pump also connects to sata power and usb to control it. I just wanted to check that I can put splitters on the pump to fan wires so that I could have 4 fans instead of 2 and wont end up overloading the motherboard header. The motherboard is an asus Z170 deluxe and does have a cpu and cpu opt header that can handle 1A (12W). It also has a water pump header but I assume this is for a custom loop pump. Was just abit worried about having 4 fans and a water cooler connected via 1 header. The fans are Corsair sp140 LED 3pin and the box says they use 0.17A but I presume the sata power connected to the corsair H115i will help the header

 

[Lutfij]

The pump only allows for use of a single set of fans which is how it's meant to be connected. I would suggest that you leave it as is since you can risk damaging the pump block unit and potentially void your warranty though I think this is worth a read as is this.

 

[Paperdoc]

First of all, the fans you propose to use as replacements are 3-pin, and those can NOT be controlled by a fan header that uses PWM Mode. Any 3-pin fan plugged into a 4-pin header using PWM Mode will simply run at full speed all the time. And NOTE that the cooling systems comes with two PWM fans!

Secondly, your concern about overloading is reasonable, but misdirected. The pump module has three hard-wired cables coming from it, and one of these plugs into a SATA power output from the PSU to provide power to BOTH the pump and its two fans. Then the two included fans must be plugged into the two male fan output cables from the pump. So the fans are getting power PLUS PWM control signals from the pump unit, and not from the mobo CPU_FAN header. It is the pump unit's capacity that is your concern.

Corsair does NOT make any statement about the capacity of the fan power outputs from its pump. IF one assumes that it is the same as a normal mobo fan header, that is 1.0 amps max and four "normal" fans could be accommodated. (But note you have the specs for the wrong fans, so check that again!) But that is an ASSUMPTION, not a spec provided by Corsair. I think Lutfij is correct to say that plugging 4 fans into the pump's 2 outputs risk overloading and voiding your Corsair warranty.

 

[Jcooper234234]

Sorry forgot to reply, i initialy had the pump on cpu1 header and two fans on each of the pump wires. It worked but the fans were just on at a constant speed which was too noisy and the point of having the extra fans was so they can run slower and quiter. In the end it works perfectly with the pump on the wpump header and 2 fans on cpu1 and 2 fans on cpu opt. In the end i just run the pump at 100% because it makes no noise. The 4 fans are controlled on a graph by the cpu temp so when doing everything but gaming the fans run at 36% and barely make any sound. The cpu sits at about 30 degrees so is perfect and quiet. When gaming sometimes the cpu gets a little stressed so the fans start to speed up to around 60-65% wich keeps the cpu at about 40-45 degrees. This is exactly what i was looking for, cpu always cool and completely silent most of the time occationaly a little sound from the fans when gaming but still never any louder than an the xbox lol

 

[Paperdoc]

So in essence you are not using the Corsair Link software to do any control of CPU temperature. You have the Corsair pump unit fed by a constant 12 VDC for full speed operation, and then are using the CPU_FAN and CPU_OPT headers to control a pair of fans each in a push / pull operation on the radiator. That has the mobo's automatic CPU cooling control system govern the CPU temperature by manipulating the speed of the radiator fans, similar to the way simpler CPU cooling systems operate.

Since you have connected the radiator fans to the mobo CPU_FAN and CPU_OPT headers (and not to the pump unit), it does not matter whether the fans you bought were 3-pin or 4-pin. Those headers are set by default to detect the fan type connected to them and adjust their operation mode accordingly.

That's a pretty good design, and you report it is working well. Congratulations.

 

[Beavinator]

The way that I am going to do mine is I ordered a Lamptron 4 channel fan controller. I am going to use 2 channels for controlling the 4 fans on my H115i. 1 channel will do the 2 top fans and the other will do the 2 bottom fans. The controller even comes with temp probes that I will place on the radiator to help me with adjusting the fan speeds. I will use 2 Y splitters to connect the 2 fans on top and bottom then run 1 wire from top to controller and 1 wire from bottom to controller. Nice and simple!