Be quiet 900 pro Cooling

se7en_ate9

Reputable
May 5, 2014
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Hi guys,

I recently started my new PC build. I have everything in place except the GPU (I'm using my old GTX 780 until the 1080ti comes out) and had a quick question about cooling. I have removed the optical bays and all of the HDD trays except for the very top one. Currently I have 3 front mounted intake fans (Noctua NF-a14 ppc-2000), 2 of which are mounted to the radiator of my H115i. I have 3 top mounted exhaust fans (be quiet silent wings 3 which were included with the case) and one rear exhaust fan (also NF-a14 ppc-2000). Are these too many fans and do you guys think this would cause more turbulent airflow within the case? Currently my CPU temps are about 26-29C idle and under aida64 load (2+ hours), the cores of my CPU range from 55-63C. All of the fans are MoBo controlled through various PWM extensions. My other question is that currently I have the 2 radiator fans mounted on the outside of the radiator (fans sit in front of the radiator, immediately behind the front filter. Is this OK or should the fans be mounted behind the radiator with the radiator immediately behind the front filter? Thanks in advance for any help!

My build:
https://pcpartpicker.com/list/6Ykmm8

I have the CPU OC'ed to 4.6 at 1.31V
I plan on getting the predator x34 3440x1440 monitor once I get the 1080ti
 
Solution
In essence you have 4 fans set in exhaust while 2 are in intake. Although the fans themselves will be different seeing how 3 are from Be Quiet! and 3 are from Noctua but you should look into each fan's airflow.
Be Quiet!'s fans
Fan speed @ 12V (rpm)1,000
Noise level @ 12V (dB(A))15.5
Air flow @ 12V (cfm / m3/h)59.5 / 101.09
Air pressure @ 12V (mm H2O)1.08
Voltage range (V DC)5 - 13.2
Input power (W)3.6
Input current (A)0.3
Connector4-pin
Lifespan (h / 25°C)300,000

Noctua's fans
Rotational Speed (+/- 10%) 2000 RPM
Min. Rotational Speed (PWM, +/-20%) 500 RPM
Airflow 182,5 m³/h
Acoustical Noise 31,5 dB(A)
Static Pressure 4,18 mm H₂O
Max. Input Power 2,16 W
Max. Input Current 0,18 A
Voltage 12 V
MTTF > 150.000 h

So the Noctua...

Lutfij

Titan
Moderator
In essence you have 4 fans set in exhaust while 2 are in intake. Although the fans themselves will be different seeing how 3 are from Be Quiet! and 3 are from Noctua but you should look into each fan's airflow.
Be Quiet!'s fans
Fan speed @ 12V (rpm)1,000
Noise level @ 12V (dB(A))15.5
Air flow @ 12V (cfm / m3/h)59.5 / 101.09
Air pressure @ 12V (mm H2O)1.08
Voltage range (V DC)5 - 13.2
Input power (W)3.6
Input current (A)0.3
Connector4-pin
Lifespan (h / 25°C)300,000

Noctua's fans
Rotational Speed (+/- 10%) 2000 RPM
Min. Rotational Speed (PWM, +/-20%) 500 RPM
Airflow 182,5 m³/h
Acoustical Noise 31,5 dB(A)
Static Pressure 4,18 mm H₂O
Max. Input Power 2,16 W
Max. Input Current 0,18 A
Voltage 12 V
MTTF > 150.000 h

So the Noctua fans seem better suited for radiators while the fans by Be Quiet! are better for airflow. I would suggest that balance the intake and exhaust and in some cases you may be able to have one more fan as an exhaust but do note that through trial and error and via your temps results, will see if the change is bearing fruits or just wasting time ;)

Regarding the second question, you can have the fans in either push or in pull but when in doubt always have them in push. There is an argument that a fan's dead zone is behind the motor housing and thus it's best to have the fans in pull but the same can be said about the core of the fan blades. If you'd like to learn more about CLC's and their setups and ofc how you can maximize the cooling, you can read through it in the watercooling sticky linked in my sig, scroll down to the Closed Loop Cooler section.

Your PCPartPicker link shows you own 4 Noctua fans...?
 
Solution