Scythe GlideStream, Slip Stream XT, and Grand Flex Fans

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Scythe Slip Stream 140XT

Specifications: Scythe Slip Stream 140XT
Manufacturer Scythe Power Rating 2.2 / 2.64 W
Model Number SM1425XT12M / SM1425XT12M-P Airflow Rating 65.2 / 69.93 CFM
Bearing Type Sleeve Speed Rating 1200 / 1300 RPM
Frame Size 140 x 140 x 25 mm (120 and 140 mm mounting holes) Noise Rating 23.2 / 23.2 dBA
Hub Size 40 mm Header Type 3-pin / 4-pin w/ molex adapter
Blade Diameter 128 mm Fan Mounts Screws, Isolators
Cable Length 50 cm Weight 180 / 190 g
Starting Voltage <3.0 / 5.0~5.5 V Number of Samples 2
Corner Type Open Retail Availability Yes
Extras: 20 cm molex adapter with 30 cm 3-pin RPM sensor cable, rubber isolators

The Slip Stream 140XT is a follow up to the Kaze Maru 2 (aka Slip Stream 140). The fan uses a standard square box frame and more traditionally shaped fan blades. The 140XT product page touts similar qualities as the GlideStream, a small hub, wide blades, and reduced air resistance.

There are five versions ranging from 500 to 1700 RPM. Scythe sent us samples of all but the fastest variant, and we settled on testing the 1200 RPM "M" and the only PWM model, the 1300 RPM "M-P". We found that "M" and 800 RPM "L" sounded practically identical while the "SL" with its 500 RPM speed had limited usefulness and both samples emitted a chuffing sound. At lower speeds, the PWM version's acoustics started to differ enough to warrant testing it separately.

Our batch of 140XT's also had a greater than average sample variation. Small differences in the level of clicking, chuffing, and humming were observed, with only the 500 RPM "SL" model samples sounding consistent with one each other.


The 140XT's blades are almost identical to the 140, being very wide and gently cured. The casing offers both 120 and 140 mm mounting options.

Scythe claims that the 140XT also impedes airflow less, but rather than due to cutting grooves into the blades, they've removed portions of the frame. Much of the plastic at the center of each side has been taken out, leaving behind three ridges.

A head on shot of the Slip Stream 140XT "M".

This is the screen capture of Fan Xpert 2's auto-analysis of the Scythe Slip Stream 140XT "M".

This is the screen capture of Fan Xpert 2's auto-analysis of the Scythe Slip Stream 140XT "M-P".

According to our test motherboard, the PWM variant bottoms out at just over 600 RPM. The standard version has a slight advantage, able to get down below 500 RPM.


Acoustic analysis of the Scythe Slip Stream 140XT "M".

Acoustic analysis of the Scythe Slip Stream 140XT "M-P."

At high speeds, the two models share a similar acoustic profile dominated primarily by turbulence. Both emit an underlying buzzing as well which is stronger on the PWM version. At lower speeds, undesirable elements start to manifest themselves. At about 900 RPM the decreased airflow allows the 3-pin model's buzzing to become more prominent, while the 4-pin model produces a high pitched tone while also generating a lower frequency hum. The tone is also more prevalent on voltage rather than PWM control. At 700 RPM, the 3-pin model develops similar problems, while the 4-pin model smoothens out with only a bit of clicking audible at close proximity.

SPCR Test Results: Scythe Slip Stream 140XT-M
Fan Speed (RPM)
1350
1100
900
700
550
SPL (dBA@1m)
27
22
17~18
13~14
11~12
Thermal Rise (°C)
17
18
20
23
26
Airflow in/out (FPM)
470/680
390/570
-
-
190/290
SPCR Test Results: Scythe Slip Stream 140XT-M-P
Fan Speed (RPM)
1450
1100
900
700
550
SPL (dBA@1m)
29
22
18
12~13
N/A
Thermal Rise (°C)
17
19
20
23
N/A
Airflow in/out (FPM)
540/790
400/590
-
-
N/A

The measured noise and thermal results were similar between the two models. The only real difference was a minor 1 dB edge for the PWM model at the 700 RPM, probably because most of its tonality vanishes at this level while the 3-pin model's profile doesn't clean up until about 550 RPM.



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