Configurazione di Ventole "Push-Pull" Asimmetrica.

[juancazp]

Ciao, in primo luogo le mie scuse per la mia inesistente lingua italiana, parlo spagnolo, ma spero che Google Translate darmi una mano.:vetro:
Vorrei chiedere se in un "push-pull" configurazione radiatore, ha senso utilizzare un "push" fan ad alta pressione statica come il Noctua NF-F12 PWM o Cooler Master Excalibur, con un ventilatore "pull" ad alta capacità di ridurre il rumore di "pull" di ventilazione e migliorare l'efficienza "push" fan.
Grazie mille.

Hello, first my apologies for my non-existent Italian language, I speak Spanish but I hope Google Translate give me a hand.
I want to ask you if in a "push-pull" radiator configuration, it makes sense to use a fan "push" with high static pressure as the Noctua NF-F12 PWM or Cooler Master Excalibur, with a "pull" fan with high capacity for reduce the "pull" fan noise and improve the "push" fan efficiency.
Thank you very much.

Hola, primero mis disculpas por mi inexistente lenguaje italiano, yo hablo español pero espero que Google Translate me de una mano.
Quiero preguntarles si en un radiador con configuración "push-pull", tiene sentido usar un ventilador "push" con alta presión estática como el Noctua NF-F12 PWM o el Cooler Master Excalibur, con un ventilador "pull" con alta capacidad, para reducir el ruido del "pull" y mejorar la eficiencia del "push".
Muchas gracias.

[Damiano]

Hello,
you can speak english without problem;)
For a push pull configuration the best configuration is composed by a fan with high pressure used as inlet fan and the second fan with high draft used as outlet fan from the dissipating surface of the radiator/heatsink.
the Noctua NF-F12 PWM is a really nice choice in both fields because as you can see from the charts into the review it have a really nice balance between pressure and fan draft:
http://www.coolingtechnique.com/recensioni/74-ventole-rheobus/1020-noctua-pwm-il-controllo-a-onda-quadra-secondo-noctua.html?start=8

another pretty interesting solution is the wing boost from alpenfoehn that is a little bit less performance against NF-F12 PWM but is also 5€ cheaper:
http://www.coolingtechnique.com/recensioni/75-dissipatori/925-recensione-alpenfoehn-k2.html?start=2

Instead, if you are searching best performance and you doesn't care about decibel the Scythe Gentle typhoon high speed is actually the most performance fan into the market:
http://www.coolingtechnique.com/recensioni/74/764.html?start=4

Welcome on CT:mano:

[juancazp]

Thank you very much, Cooling Technique is definitely the benchmark in water cooling!!!:ave:

I have to choose carefully, because my setup is two push-pull 3x120mm rads => 12 fans in total ($$$) and I think the Noctua NF-F12 PWM will be my choice.

I have another couple of questions.
The Cooler Master Excalibur is a complete mystery to me. According to the review, it may be a good choice as push fan for the rads, but is relatively noisy. Some Customer Reviews on Newegg say the noise is less when operating in 4 pin PWM mode (my MB is a nice Asus with all 4-pin fan headers). Can this help improve their performance?

And finally, you could recommend me a 140mm PWM fan with good CFM capacity? (case fans controlled by the MB)
Again, thank you very much for your time.

[Damiano]

I have another couple of questions.
The Cooler Master Excalibur is a complete mystery to me. According to the review, it may be a good choice as push fan for the rads, but is relatively noisy. Some Customer Reviews on Newegg say the noise is less when operating in 4 pin PWM mode (my MB is a nice Asus with all 4-pin fan headers). Can this help improve their performance?
PWM (pulse width modulation) is just a an electronic technique to control a fan, this doesn't improve at all the performance since its intent is just to control the impeller in according to the system's temperature.
low cpu temperature===>low rpm, fans are quiet
high cpu temperature===>fan to full rpm, pretty noisy
Also keep in mind that split a single PWM signal for 12 fans isn't possible because at every single fan the signal lost a little bit o its power so the first fan will be controller by PWM but the last not, or better, the last fan will receive a "dirty signal".

In my opinion if you are searching a very powerfull fan for a push setup the corsair SP120 High performance is really a good choice:
http://www.coolingtechnique.com/recensioni/74-ventole-rheobus/1058-recensione-corsair-air-serie-120-a-140mm.html?start=7
it provide high value of static pressure and allow you a quite good range of downvolt from 5 to 12v with interesting data at 7v concerning decibel:
http://www.coolingtechnique.com/img/rece/ventole-rheobus/corsair/air-series/sp120-high-performance.png

if you are searching instead a balanced fan in different field(pressure/CFM and decibel) the Noctua NF-F12 and the alpenfhoen wing boost are at the moment one of the best solutions into the market.
In any case for the control of the twelve fans a fan controller will be more accurate than PWM, allowing you to set the speed of single or multiple fans as you prefer. Also with a fan controller with at least 20W for a channel will allow you to control the pump speed.



And finally, you could recommend me a 140mm PWM fan with good CFM capacity? (case fans controlled by the MB)
Again, thank you very much for your time.
the best is the noctua again:
http://www.coolingtechnique.com/img/rece/ventole-rheobus/corsair/air-series/rpm-cfm-140.png

[juancazp]

Ok, I'll take the Noctua NF-F12 PWM.

I solved the fan control with this cable:

http://www.frozencpu.com/products/13548/cab-464/Akasa_Flexa_FP5_PWM_5-Way_Splitter_-_Smart_Fan_Cable_AK-CBFA03-45.html

http://www.frozencpu.com/images/products/main/cab-464.jpg

I control 4 fan groups, 3 push and 3 pull both the CPU rad and the Xfire rad. The tachometer signal is measured from a single fan and the fans are powered for a Molex connector, not directly from the MB. The PWM control signal comes from the MB 4-pin header for the CPU and for the Xfire rad from the first video card 4-pin header. I've tested and works perfect (the Asus Fan Xpert2 PWM Control works like a charm).:ok:

Thank you very much. I can now confidently buy the fans and overclocking my rig a few good MHz. :asdpc:

[Damiano]

perfect, post some pics when you finish the work;)