Deepcool Gamer Storm Maelstrom 240 AIO Liquid Cooler

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Noise Measurements

Specifications: Deepcool Maelstrom 240 Stock Fan
Manufacturer Deepcool Power Rating 3.12 W
Model Number GF120 Airflow Rating 182.24 CFM
Bearing Type Fluid Dynamic Speed Rating 600 ~ 2200 RPM
Frame Size 120 x 120 x 25 mm Noise Rating 17.6 ~ 39.3 dBA
Hub Size 40 mm Header Type 4-pin PWM
Blade Diameter 111 mm Starting Voltage 4.0 ~ 4.5 V
Cable Length 30 cm Weight 150 g
Corner Type Open Retail Availability No
Data in blue cells provided by the manufacturer or observed; data in the green cells were measured.

The included 120 mm fan model is a higher speed (2200 RPM vs. 1800 RPM) variant of the GF120, a boxed fan sold separately by Deepcool also under the Gamer Storm brand. Aside from its rubber housing, it has a relatively pedestrian nine-blade design with fluid bearings. Compared to most AIO cooler fans, it has less aggressive curvature, not appearing to have been designed with increasing static pressure in mind. As a result, it has a more pleasant sound overall.

Noise Measurements:
Deepcool Maelstrom 240 Pump
Speed Setting
SPL @1m
2600 RPM
17~18 dBA
2170 RPM
15 dBA
1300 RPM
12~13 dBA
Stock Fans
100% (PWM)
2140 RPM
44 dBA
70% (PWM)
1530 RPM
36 dBA
50% (PWM)
1300 RPM
29 dBA
40% (PWM)
1070 RPM
23 dBA
30% (PWM)
820 RPM
16~17 dBA
25% (PWM)
700 RPM
13~14 dBA
0% (PWM)
580 RPM
12~13 dBA
100% / 40%
2600 / 1070 RPM
24 dBA
100% / 30%
2600 / 820 RPM
20 dBA
40% / 40%
1300 / 1070 RPM
23 dBA
40% / 30%
1300 / 820 RPM
16 dBA
40% / 25%
1300 / 700 RPM
15 dBA
40 % / 0%
1300 / 580 RPM
13 dBA
Measuring mic positioned 1m at diagonal angle from the center of CPU.
Ambient noise level: 10~11 dBA.

Note: According to RPM reporting on our system, the pump motor spins at 5200 RPM at full speed, almost double that of the rated speed. It's highly unlikely this is true, rather the result of a bug with regard to how the speed is reported. As such, these figures have been halved (presumably) to be more accurate.

The pump is reasonably quiet, producing 17~18 [email protected] at top speed, and can be made nearly inaudible by cutting the speed in half. It's powered by a 3-pin connector so it requires a separate header that supports voltage control in order to be slowed down. The stock fans are unbearably loud at top speed but with PWM control, they can be slowed to just shy of 600 RPM. At this level, they produce the same amount of noise as the pump running at half speed. To achieve quiet noise levels under normal operation, one or both must be slowed down considerably.

The stock fans sound whiny and turbulent at high speeds like most fans but at lower speeds they have a mostly smooth, broadband acoustic profile. Unfortunately one of the fans emits an odd ghostly tone in the 25~30% speed range. This appears to be a manufacturing defect or the result of shipping damage as a third sample from a different Deepcool product sounds fine. Despite this issue, the pair still sound superior than most fans that ship with liquid coolers.

On its own, the pump emits a high frequency buzzing which lowers in intensity as the speed is reduced. It has a consistent nature which makes it preferable to some competing models. There also is almost no audible water noise from the system, that is to say it has a distinct lack of dripping and gurgling sounds which often afflict AIO coolers.

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