Scythe Ashura CPU Cooler

Cooling
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STOCK FAN MEASUREMENTS

Specifications: Scythe Ashura Stock Fan
Manufacturer Scythe Power Rating 4.44 W
Model Number SY1425HB12M-P Airflow Rating 37.37 ~ 97.18 CFM
Bearing Type Sleeve Speed Rating 500 ~ 1,300 RPM
Frame Size 140 x 140 x 25 mm Noise Rating 13 ~ 30.7 dBA
Hub Size 40 mm Header Type 4-pin PWM
Blade Diameter 129 mm Starting Voltage 3.0 ~ 3.5 V
Cable Length 30 cm Weight 150 g
Corner Type Open Retail Availability Yes
Additional notes:

The Glide Stream 140 is housed in an octagonal frame with square corners to accommodate 120 mm mounting holes. The hub is relatively small, the blades are skinny, and struts are curved in the opposite direction. This general design is carried over from the Slip Stream 120 series which offered excellent performance and acoustics. The version shipping with the Ashura is a PWM model with a speed of 1300 RPM. Like the Mugen 4, the Ashura's fan lacks the anti-vibration padding that ships with retail versions of the Glide Stream line.

Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1440 RPM
34 dBA
9V
1110 RPM
26 dBA
8V
900 RPM
19 dBA
7.6V
710 RPM
14~15 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

At full blast, the Glide Stream is a terror, pumping out a very high and turbulent-sounding 34 dBA@1m. More of the same is produced at 9V, though at 26 dBA@1m it's more bearable. At 8V it becomes quiet and its profile is much smoother and broadband, though up close the bearing emits a slight off-kilter flutter. Between 8V and 7V, the speed drops off dramatically so we chose a voltage that produced about 700 RPM (7.6V) for our last test point. At this level the fan is barely audible from one meter's distance but up close we did detect some bearing chatter. Overall, the sound of the fan is well above average, though it has some complexity that the Slip Stream series lacked.

The Glide Stream's acoustic profile matches up very well to that of our Noctua 140 mm reference fan, one of the best-sounding models in our arsenal. With both fans running at 8V, the frequency distribution is eerily close with the exception of a few minor tonal peaks, most notably at about 350 and 1500 Hz, which contributes to the Glide Stream's slightly higher noise level.


This is the screen capture of Fan Xpert 2's auto-analysis of the Ashura stock fan on voltage control..

This is the screen capture of Fan Xpert 2's auto-analysis of the Ashura stock fan on PWM control.

While the fan's speed takes a noise dive below 8V on voltage control, its low starting voltage (< 3.5V) allows it to spin up at just 300 RPM. The fan is also easily silenced on PWM control, with a minimum speed of about 400 RPM.



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