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Push/Pull Configuration with LED and High Performance fans possible?

post #1 of 6
Thread Starter 
Hey guys,

I have a small question since I am finishing off planing my build.
I decided to have 3 rads:

Alphacool NexXxoS Monsta 360mm - External top - exhaust
Alphacool NexXxoS Monsta 280mm - Internal front - intake
Alphacool NexXxoS UT45 Full Copper 140mm - internal rear - intake

Will it be fine if I have 2 LED fans in the front rad for a push and 2 PWM fans for a pull config?

Case - Corsair Obsidian 750D
post #2 of 6
There could be air turbulence between the fans in push/pull if the fans have different cooling capabilities. Always try the match the same fans together when using push pull. That's possible in your case. See image below:

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post #3 of 6
The fans can be whatever you want them to be but just make sure to have the push/pull pairing to be the same fan so that they don't prematurely wear out. Also, try not to pair different fans just because they have the same specifications. I guarantee you that through different test methodology, the numbers are never accurate. Since you'd want every pair to perform similarly, there's no point in having one fan being a PWN. Either have both be PWN and running under the same setting or make both fans non PWN to save money. I use 12 Cooler Master Sickle Flows on two 480 rads (one being push/pull, the other being pull only) and it doesn't matter what I do, temperatures never rise past the initial few seconds of full load. I'd say they perform very well. Though you will hear twelve 2000rpm fans up against radiator grills, I've gotten used to them and am normally listening to music anyway so it doesn't bother me. They also come in LED options or non LED.
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post #4 of 6
Mixing different types of fans in push-pull isn't a big deal. They will not "prematurely wear out". Martin (of martinsliquidlabs) even encourages mixing fans, but they should be running somewhat close to the same speeds as each other at all times, so having one side's speeds PWM controlled and the other voltage controlled would be a bad idea.
Quote:
Originally Posted by Martinm210 View Post

Absolutely, I encourage mixing of fans and have done it many times. The mixing fan phobia generate by forum members is really just another forum myth by users not knowing. I have yet to see any testing to show it being a problem. Actually I have found mixing two different fans to be a benefit at times. When testing the H220 I found two AP15s plus two Helix to be a great match. The helix alone seemed to have a little harmonic under pressure in push only that goes away and smooths out when the GTs were added. Also anytime you mix like fan speeds you can get rpm harmonics so having fans at speeds that are a few hundred off is a good thing.

Noctua even does mixing of fans and speeds on their NH-D14.

While it may not make sense to mix 5000rpm Deltas with 1200rpm yates, I sure wouldn't worry about 500rpm differences particularly when resistance like a radiator is keeping air flows well below either fans max air flow rate. Mixing fans is a good thing..smile.gif
post #5 of 6
Thread Starter 
I was to mix Spectre Pro PWM and Spectre Pro LED. They have different air on water pressure. So if I cant put two LED at the front for push and two PWM for a pull, then i will get some LEDs and put them around the fans.

I wonder however, where can I connect 11 fans if my MB supports only 8...
post #6 of 6
Quote:
Originally Posted by whiteskymage View Post

I was to mix Spectre Pro PWM and Spectre Pro LED. They have different air on water pressure. So if I cant put two LED at the front for push and two PWM for a pull, then i will get some LEDs and put them around the fans.

I wonder however, where can I connect 11 fans if my MB supports only 8...

Get some splitter cables.
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CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
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