How to Set Up H100i RGB in Push/Pull Configuration?

[Kawzman]

I’m contemplating setting up my Corsair H100i RGB PLATINUM CPU cooler in a push/pull configuration. The goal is better efficiency at lower fan RPMs for less fan noise. The H100i block only supports 2 fans via 2x 4-pin connectors. Would the system fully support 4 fans if I use a y-splitter to connect 2 fans to each 4-pin connector?

The power draw for the 2x stock Corsair ML120 PRO RGB fans is 0.219 Amps each. I was thinking of using 2x Corsair ML120 fans as the push fans (don’t need RGB on that side); their power draw is also 0.219 Amps each. Total fan power draw would be 0.876 Amps. I pulled those specs for the Corsair website, but please let me know if those numbers are wrong.

The unknown is the power draw for the H100i pump, it’s not listed on the Corsair website and I came up empty with Google. Anyone know? If the H100i can support those 4 fans, next I have to figure out if the SATA power cable can support the total cooling system’s power draw with an EVGA SuperNOVA 750W G3 PSU. I suspect the answer is yes. To confirm, the pump is not drawing power via the tach cable connected to the CPU_FAN header, it’s only sending pump speed info to the motherboard correct?

If the H100i can support the 4 fans, is there a recommended compatible y-splitter cable?

How would this setup work for the fan speed control with the 4 fans connected via y-splitters? Will the RPMs for all four fans be reported or would only 1 or 2 be reported and the value(s) controlling the RPMs for all 4 fans by the speed controller software?

My in-progress rig build can be viewed here...https://ca.pcpartpicker.com/list/GmgG8M.

Thoughts greatly appreciated. Thanks for the support!

 

[bigtallanddopey]

So yes the pump draws it’s power from a sata/molex cable and not the motherboard fan header.

Can you not plug the other two fans directly into the motherboard? And control them that way?

A splitter cable will probably work and be ok, however it depends on the power output. You will end up sharing the power output for one fan between two and so the fans may run even slower than what you want.

 

[Kawzman]

So yes the pump draws it’s power from a sata/molex cable and not the motherboard fan header.

Can you not plug the other two fans directly into the motherboard? And control them that way?

A splitter cable will probably work and be ok, however it depends on the power output. You will end up sharing the power output for one fan between two and so the fans may run even slower than what you want.

X570 Taichi only has 4 case fan headers. I'm gonna have 3x Corsair LL140 RGB fans connected.

 

[bigtallanddopey]

X570 Taichi only has 4 case fan headers. I'm gonna have 3x Corsair LL140 RGB fans connected.

That’s a bit rubbish. But is what it is.

If the pump cannot support 4 fans then each motherboard fan header can output 2 amps so using those with a splitter would be no problem.

The h100 may be ok to use with 4 fans and maybe someone has done so on here. Just sometimes you have to be careful with things like that. Normally companies only make something able to just do its job to save money and if running it on the power limit is one way of saving they will do it.

 

[trents]

I'm concerned that using splitters may confuse the Corsair fan speed control technology.