Scythe GlideStream, Slip Stream XT, and Grand Flex Fans

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Scythe GlideStream 120

Specifications: Scythe GlideStream 120
Manufacturer Scythe Power Rating 1.32 / 2.04 W
Model Number SY1225HB12LM / SY1225HB12M-P Airflow Rating 54 / 73.39 CFM
Bearing Type Sleeve Speed Rating 1000 / 1300 RPM
Frame Size 120 x 120 x 25 mm Noise Rating 18.5 / 26.1 dBA
Hub Size 36 mm Header Type 3-pin / 4-pin with molex adapter
Blade Diameter 112 mm Fan Mounts Screws
Cable Length 50 cm Weight 120 g
Starting Voltage <3.0 / 3.5~4.0 V Number of Samples 2
Corner Type Open Retail Availability Yes
Extras: 20 cm molex adapter with 30 cm 3-pin RPM sensor cable, dampened mounting holes

The GlideStream 120 has nine models in total, seven 3-pin variants ranging from 600 to 2000 RPM in speed, and a couple of PWM versions which spin at 1300 and 1900 RPM. Scythe provided us with samples of the 600, 800, 1000, 1200, and 1300 RPM PWM models. Due to acoustic similarities, the 1000 RPM "LM" model was picked to represent itself and its lower speed brothers. The 1300 RPM PWM model was also tested as it, along with the 1200 RPM "M" model, has a more buzzy acoustic character.

Except for the "M" variant, all the 3-pin models seemed to have one sample that had worse acoustics than the other, typically characterized by a stronger clicking characteristic up close. The difference wasn't enough to make us worry about the sound quality you'll get from any given sample, but it is somewhat disconcerting to see this small variation throughout the entire line.


The GlideStream 120 is essentially the same as the bigger model, only in a more traditional 120 mm box frame.

A head on shot of the GlideStream 120"LM".

This is the screen capture of Fan Xpert 2's auto-analysis of the Scythe GlideStream 120 "LM".

This is the screen capture of Fan Xpert 2's auto-analysis of the Scythe GlideStream 120 "M-P".

Both the standard and PWM version of the fan have a very low starting and minimum speed. Below 500 RPM, almost all fans are inaudible at one meter's distance --- anything lower has little practical advantage.


Acoustic analysis of the Scythe GlideStream 120 "LM" .

Acoustic analysis of the Scythe GlideStream 120 "M-P".

Given its higher rotational speed, at full blast, the PWM version sounds more turbulent. At ~1100 RPM, at close proximity, it emits a buzzing sound, while the 3-pin model produces a more audible low pitched hum. This difference is notable when the fans are both set to 900 RPM — the standard model exhibits a higher total peak at ~180 Hz. At lower speeds the 3-pin version continues to generate a dull hum though it's not unpleasant and the 4-pin model has a tendency to click though it's hard to make out from a distance. Overall, the PWM variant has a slight edge but both GlideStream 120s and the 140 are in the same ballpark.

SPCR Test Results: Scythe GlideStream 120-LM
Fan Speed (RPM)
1100
1050
900
700
550
SPL (dBA@1m)
N/A
17
14
11~12
11
Thermal Rise (°C)
N/A
21
23
26
30
Airflow in/out (FPM)
N/A
430/670
-
-
210/330
SPCR Test Results: Scythe GlideStream 120-M-P
Fan Speed (RPM)
1350
1100
900
700
550
SPL (dBA@1m)
23
17
13
11~12
11
Thermal Rise (°C)
19
21
23
28
30
Airflow in/out (FPM)
550/820
480/650
-
-
220/310

Despite these difference the measured noise level was similar for the two fans. Performance-wise they were very close as well, except for the PWM version holding a 2°C advantage at 700 RPM.



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