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post #1 of 19 (permalink) Old 06-18-2019, 11:04 AM - Thread Starter
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How to manage 20+ PWM fans?

Hi folks,

I was curious about a few things since it's been a while that I approached this.

First, how can one easily manage 20+ fans using PWM? Ideally I'd like to be able to do this through the motherboard, but is this impossible? I was looking at getting a few of these: https://www.amazon.com/Aquacomputer-.../dp/B01IZ1LB44 but I'm not entirely sure how all of that works. Does it still recognize the fact that each fan is an individual, or would I need to get something like a separate fan controller?

Second, is the splitter I mentioned above what I should be using? I would obviously need at least 3 of them (I say "at least" because sometimes my fans may not reach the splitter).

What would you guys do if money wasn't really an object?

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post #2 of 19 (permalink) Old 06-18-2019, 11:15 AM
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Corsair commander, some of these, and some creativity with cable management.

Those whips are required as the Commander only allows 1 amp per channel I think. With this setup, you get 4 channels of 5 fans per with the ability to set those channels however you like.

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post #3 of 19 (permalink) Old 06-18-2019, 11:20 AM
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Do you need to control the speed of each fan individually?

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post #4 of 19 (permalink) Old 06-18-2019, 11:24 AM
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Quote: Originally Posted by The Pook View Post
Do you need to control the speed of each fan individually?
I sure as hell hope not. Imagine the rats nest.

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post #5 of 19 (permalink) Old 06-18-2019, 11:33 AM
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Quote: Originally Posted by Renegade5399 View Post
I sure as hell hope not. Imagine the rats nest.





hope not too, but I'd imagine he wouldn't want them all controlled identically either. 2 or 3 zones controlled individually should be manageable though.

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post #6 of 19 (permalink) Old 06-18-2019, 11:42 AM
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Yea, that's what I run. 3 zones, 4-5 fans per zone. Rad fans are 1 zone since it's a single loop. Top fans another zone and front fans the last. The Commander is nice because it's USB and is programmed with iCUE, but DOES NOT require iCUE once you configure the sensors and set-points. That was a HUGE plus for me. Not to mention there's no other affordable programmable PWM controllers out there besides a DIY one.

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post #7 of 19 (permalink) Old 06-18-2019, 11:43 AM - Thread Starter
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Quote: Originally Posted by The Pook View Post
Do you need to control the speed of each fan individually?
I suppose that's what I was intending, but if it doesn't make sense and isn't easy to accomplish, then I suppose not. On my current setup, I've got different "groups" of fans each hooked up to a specific channel on my Lamptron FC Touch. So "fan 1" is actually 4 push fans on my 480 radiator. "Fan 2" would be the 4 pull fans on the same radiator, etc. What I find extremely frustrating/annoying about this setup is that I have no idea how to determine if a fan fails or isn't working. That's the only reason I was hoping for something that could keep track of the fans individually, if that makes sense.

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post #8 of 19 (permalink) Old 06-18-2019, 11:48 AM
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Quote: Originally Posted by The Pook View Post
Do you need to control the speed of each fan individually?
Quote: Originally Posted by xyeLz View Post
I suppose that's what I was intending, but if it doesn't make sense and isn't easy to accomplish, then I suppose not. On my current setup, I've got different "groups" of fans each hooked up to a specific channel on my Lamptron FC Touch. So "fan 1" is actually 4 push fans on my 480 radiator. "Fan 2" would be the 4 pull fans on the same radiator, etc. What I find extremely frustrating/annoying about this setup is that I have no idea how to determine if a fan fails or isn't working. That's the only reason I was hoping for something that could keep track of the fans individually, if that makes sense.
What fans are you using that are failing? If this is a workhorse machine, just "pony" (ha-ha get it?) up the cash and get enterprise class fans. I run all Deltas throttled back and they are as quiet as consumer fans. I however have a ton of RPMs left so if there is a critical temp spike my controller spins them up to 100% which is ~153cfm @ 4000RPM.

Monitoring the fans may not be your issue as much as your fan quality.

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post #9 of 19 (permalink) Old 06-18-2019, 11:56 AM
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post #10 of 19 (permalink) Old 06-18-2019, 12:08 PM - Thread Starter
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Quote: Originally Posted by Renegade5399 View Post
What fans are you using that are failing? If this is a workhorse machine, just "pony" (ha-ha get it?) up the cash and get enterprise class fans. I run all Deltas throttled back and they are as quiet as consumer fans. I however have a ton of RPMs left so if there is a critical temp spike my controller spins them up to 100% which is ~153cfm @ 4000RPM.

Monitoring the fans may not be your issue as much as your fan quality.
Hah. Good one.

TBH, it's not about the fans themselves - I believe at one point I was having an issue getting enough power to the fans. I'm not really sure. The Lamptron fan controller did some weird things. I work in IT so I just like to be able to make sure everything is working. I also literally can't see the fans in between my two rads unless I lift my case off the floor and look underneath, so that doesn't help my situation. I've got decent fans (Gentle Typhoon 3ks) that have been spinning almost nonstop for 8 years now, but it's more just a peace of mind thing. They're also very loud even at low RPM, so I'm looking for something significantly quieter.

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