Where do you connect the case fans on the Asus Strix z270e mobo?

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gosubuilder

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(This will be my first build, please be kind to this noob :??: )

PCPartPicker part list / Price breakdown by merchant

CPU: Intel Core i5-7600K 3.8GHz Quad-Core Processor ($229.00 @ Amazon)
CPU Cooler: CRYORIG H5 Universal 65.0 CFM CPU Cooler ($46.88 @ OutletPC)
Motherboard: Asus STRIX Z270-E GAMING ATX LGA1151 Motherboard ($186.99 @ SuperBiiz)
Memory: G.Skill Trident Z 16GB (2 x 8GB) DDR4-3200 Memory ($134.99 @ Newegg)
Storage: MyDigitalSSD BPX 512GB M.2-2280 Solid State Drive ($209.99 @ Amazon)
Video Card: EVGA GeForce GTX 1070 8GB SC Gaming ACX 3.0 Video Card ($399.99 @ Amazon)
Case: NZXT S340 Elite (White) ATX Mid Tower Case ($89.99 @ SuperBiiz)
Power Supply: EVGA SuperNOVA G3 650W 80+ Gold Certified Fully-Modular ATX Power Supply ($88.89 @ OutletPC)
Case Fan: Corsair ML120 Pro LED White 75.0 CFM 120mm Fan ($24.98 @ OutletPC)
Case Fan: Corsair ML140 Pro LED 97.0 CFM 140mm Fan ($28.79 @ Amazon)
Case Fan: Corsair ML140 Pro LED 97.0 CFM 140mm Fan ($28.79 @ Amazon)
Case Fan: Corsair ML140 Pro LED 97.0 CFM 140mm Fan ($28.79 @ Amazon)
Total: $1498.07
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-04-21 13:55 EDT-0400

I am using NZXT 340 Elite case with Asus STRIX Z270-E ATX mobo, and CYRORIG H5 Universal for CPU cooler.

I'm planning to use 2 x 140mm fans on the front for intake, 1 x 140mm fan on the top exhaust, and 1 x 120mm fan on the rear exhaust. (all the fans are PWM 4pin fans) This is after reading recommendations from SR-71 Blackbird

I looked at the ASUS manual, but I'm not sure where to plug in the fan 4pin connectors. I know that the CPU cooler should go on the CPU_FAN header, the MOBO has a CHA_FAN1 and CHA_FAN2 headers I will be using to connect the 2 x 140mm front fans for intake. But, where do the top and rear fans connect to on the MOBO? Do I connect them to the H_AMP_FAN and the AIO_PUMP headers? Or am I out of luck with this MOBO.

TLDR: two front fans connect to the cha_fan1 and cha_fan2, where should i connect the top and rear fans to on the ASUS STRIX Z270e mobo?
 
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AIO_PUMP is intended as the power source for the pump part of a liquid cooling system for the CPU. I'm not sure whether it actually controls the pump speed, or is always set to full speed. I expect it can do the control part for the pump. But the fans that cool the radiator part of the system are controlled separately, and some systems leave that control job also to the mobo headers. So the mobo makers provide for separate headers that can be configured differently for those two control jobs, but they share a common temperature sensor - the one built into the CPU chip.

The CPU_OPT header also has its control based on that same temperature sensor, but its control is just a duplicate of the CPU_FAN header. It is most often used for...
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Paperdoc

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You'll have four 4-pin fans and two CHA_FAN headers available, without even considering the H_AMP_FAN header. That's plenty.

I suggest you get two simple 4-pin fan SPLITTERS like this

https://www.newegg.com/Product/Product.aspx?Item=N82E16812423160&cm_re=fan_splitter-_-12-423-160-_-Product

Use one on each CHA_FAN1 and CHA_FAN2 header. Then you can connect both front fans to one splitter, and both exhaust fans to the other. OR, of the cabling is easier, connect both bottom fans to the CHA_FAN2 header at the bottom, and the two upper fans to CHA_FAN1. It does not matter. Each fan header can easily supply two fans with power. Those two headers will do the same control job, so it does not matter which fan is connected to which.

Your mobo's manual does NOT indicate this, but take a look anyway. SOME mobos have an option when you configure the fan headers to select which temperature sensor is used for each header. IF you have that choice, set yours to use the Motherboard temperature sensor.

I do not recommend using the AIO_PUMP or CPU_OPT headers for case ventilation fans. Although your mobo has a H_AMP_FAN header for use with high-power fans, you do not need to use it for what you are doing.
 
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gosubuilder

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What is the reasoning behind not recommending AIO_PUMP, CPU_OPT, and H_AMP_FAN header? (Trying to learn)

Also using the recommended splitters at CHA_FAN will they be long enough to reach the fan connectors from rear and top exhaust fans on the nzxt s340 elite case? I'm hoping to run it behind the back side of the case for cable management.
 
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Paperdoc

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AIO_PUMP is intended as the power source for the pump part of a liquid cooling system for the CPU. I'm not sure whether it actually controls the pump speed, or is always set to full speed. I expect it can do the control part for the pump. But the fans that cool the radiator part of the system are controlled separately, and some systems leave that control job also to the mobo headers. So the mobo makers provide for separate headers that can be configured differently for those two control jobs, but they share a common temperature sensor - the one built into the CPU chip.

The CPU_OPT header also has its control based on that same temperature sensor, but its control is just a duplicate of the CPU_FAN header. It is most often used for systems with two fans cooling the CPU chip, so that you want them both to do the same thing. In both cases, the issues are two-fold. One is that control of these headers is based on the internal CPU chip temperature, whereas you want the case ventilation fans to cool according to the temperature measured on the mobo. The other is that these CPU-oriented headers have fan failure monitoring systems that fully expect the fan connected to them to cool the CPU. They are set to send out error messages if CPU cooling fails, and sometimes even to shut down quickly to prevent CPU damage from overheating. You don't want that to happen if a case fan fails.

The H_AMP_FAN header is capable of supplying twice as much amperage (2 amps max, rather than 1) as a regular CHA_FAN header. Mostly this is used for special high-power fans that some people use. Sometimes it is used with multiple Splitters to connect many fans to this one header. But your system will have only four fans of normal current consumption, so it is easy and quite acceptable to connect two fans each to the two regular CHA_FAN headers.

Regarding Splitter cable lengths, the one I linked has arms 6" long. If you need longer, look at this similar one

https://www.newegg.com/Product/Product.aspx?Item=N82E16812423162&cm_re=fan_splitter-_-12-423-162-_-Product

It has three outputs on one splitter (you only need two for each of your splitters), but the main feature is that it is 16" long overall, with the output second from the end being 12" away from the mobo connector.
 
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