z270e fan question?

[New_Fish]

I'm putting together a system with the parts listed below.

I have four 140mm intake fans. Three are powered from the chassis fan controller and I'm planning to plug in the fourth fan in either of the open chassis fan connectors on the motherboard.

But I'm not sure where to plug in the fan power for the fans on the rads for the video cards. The instructions say to plug in at SYSFAN1. But that's not something that exists in my motherboard documentation...and I have two of them to plug in.

CPU_OPT - open
CPU_FAN - connected to H110i feedback line
CHA_FAN1 - open
H_AMP_FAN - open
AIO_PUMP - open
EXT_FAN - open
CHA_FAN2 - open

CPU Cooler Corsair - H110i 113.0 CFM Liquid CPU Cooler
Motherboard Asus - STRIX Z270-E GAMING ATX LGA1151 Motherboard
Video Card 2 x Corsair - GeForce GTX 1080 Ti 11GB Hydro Video Card (2-Way SLI)
Case Fractal Design - Define R5 (Titanium) ATX Mid Tower Case

Where is the best spot to plug in the fans for the graphics card rads?

Thanks for the help!

 

[Ketchup]

4 intake fans? Where? You shouldn't need more than 2 max. Are you counting the water cooler fans?

 

[Campy]

Plug it in anywhere, I guess. The speed won't be controlled according to GPU temperature anyway so just make sure they're powered and leave them at 40% or 50% in the bios. That should probably be plenty to keep temps in check, but play around with it if you're not happy with either thermals or noise.

 

[New_Fish]

4 intake fans? Where? You shouldn't need more than 2 max. Are you counting the water cooler fans?

The H110i has two 140mm output fans. (top) Each 1080Ti Hydro has a 120mm output fan. (one top, one rear) There are two Fractal Design 140mm input fans in front. There is one Fractal Design 140mm input fan on bottom. There is one Fractal Design 140mm input fan on the side. All the inputs are filtered.

Based on CFM max ratings, I have ~10 more CFM on inputs than on outputs. (I only have CFM rating on the fans used on the 1080ti rads, not what the CFM is on the whole assembly, so at max I probably have a little more positive pressure.)

Based on reviews of the cards, I think I can do some substantial OCs with ~60% fan settings and still keep it under ~40dBA.

I read something about fan connections on motherboards failing and bad things happening as a result, so I wasn't sure I could just pick connection points and go from there.

Here's a picture.

https://ibb.co/fFyciG

 

[Ketchup]

Ah, I see you have water on everything. In that case, personally, I wouldn't use a side fan or a bottom fan. The side fan just makes noise, the bottom fan will make noise and clog its filter with dust from the floor. All you need is the front fans that target air at the rads, and any drives you may have. Any extra cfm the water cooling fans pull is going to come from those openings anyway. The extra fans are only going to make it noisier.