Cooler Master Seidon 240M: Dual Fan Liquid CPU Cooler

Cooling
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Noise Measurements

Specifications: Cooler Master Seidon 240M Stock Fan
Manufacturer
Power Rating
3.6 W (4.44 W according to label)
Model Number
A12025-24RB-4CP-F1
Airflow Rating
19.17 ~ 86.15 CFM
Bearing Type
Rifle
Speed Rating
600 ~ 2400 RPM
Corners
Open
Noise Rating
19 ~ 40 dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin
Blade Diameter
113 mm
Starting Voltage
4.4 V
Hub Size
42 mm
Weight
160 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

The Seidon 240M ships with a pair of 120 mm PWM fans from Cooler Master's Blade Master series; a similar model was used with the popular Hyper 212 Plus. This line has a unique twisted blade design, presumably to increase air pressure which is vital for cooling the densely packed radiator coils. It's a high speed, seven blade model with curved struts and a very large hub that unfortunately eats up a sizable portion of the fan's area.

Stock Fan Measurements
Voltage
Avg. Speed
SPL@1m
12V
2220 RPM
44 dBA
9V
1630 RPM
35 dBA
7V
1140 RPM
25 dBA
6V
880 RPM
19 dBA
5.5V
750 RPM
16~17 dBA
5V
460 RPM
12 dBA
Pump Measurements
12V
N/A
18 dBA
9V
17 dBA
7V
13~14 dBA
Measuring mic positioned 1m at diagonal angle from the center of the cooler base.
Ambient noise level: 10~11 dBA.

The two fans we received were not perfectly matched, with a variance between them of 50 to 80 RPM; the average nominal speed was just over 2200 RPM. The pair were very noisy at top speed, emitting a strong buzzing and humming, both of which dissipated as the speed dropped. They became bearable at ~ 1100 RPM, and quiet at 900 RPM. The range of the fans is impressive, an earsplitting 44 dBA@1m at 12V to an almost inaudible 12 dBA@1m at 5V.

From a noise perspective, water cooling units have a significant weakness — the pump that circulates the liquid through the loop. In the 240M, the pump was actually fairly quiet, not exhibiting the harsh sounds we've encountered in the past with similar coolers. It emitted a low frequency buzz with the occasional slight rattle at 12V but generated only 18 dBA@1m. At 9V, the noise level dropped by 1 dB, but subjectively it sounded worse as the pitch seemed to increase. At 7V, it was barely audible.

Pump & Fan Measurements
Pump Voltage
Fan Voltage
SPL@1m
12V
6V
22 dBA
5.5V
20 dBA
5V
19 dBA
7V
6V
19 dBA
5.5V
17 dBA
5V
14 dBA
Measuring mic positioned 1m at diagonal angle from the center of the cooler base.
Ambient noise level: 10~11 dBA.

At 7V and above, the fans produce so much noise they drown out the pump almost completely, so undervolting the pump for silencing purposes only has an effect when the fans are slowed down as well. Quiet levels are achievable with the pump at full speed, but finding a balance between pump and fan noise rewards the user with lower noise.



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