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Scythe Slip Stream 140 (SM1425SL12H)

The Japanese Scythe Co., Ltd. also offers a wide range of fan products, but for our today’s roundup we will only look at Scythe Slip Stream 140 represented by four models with different rotation speeds: 500 (SM1425SL12SL), 800 (SM1425SL12L), 1200 (SM1425SL12M) and 1700 (SM1425SL12H) RPM. We received the top model in this lineup - SM1425SL12H.

The fans are packed in a clear plastic box with a sheet insert inside:

The latter has a ton of information on it, including the fan specs in six different languages. Among the bundled accessories we find four self-tapping screws and an adapter cable with a PATA connector:

Scythe Slip Stream 140 fans measure 140x140x25 mm with retention holes to fit 120 mm fan mounting spots:

  

Both, the fan frame and impeller are of radical black color. The whole fan weighs 141 g. The diameter of the impeller sitting on three 6 mm pins and one 10 mm pin is only 127 mm, which is the smallest of all today’s testing participants. But the rotor of this fan is also the smallest - only 40 mm in diameter.

Nine crescent-shaped blades have sloped ends (the distance between the blades and the fan frame changes from 1 to 2 mm as the blade widens towards the end. The inside of the fan frame is pretty interesting: it has one raised rib where the airflow comes in, and then a smooth contour along the edge on airflow exit:

Could it be helping Scythe Slip Stream 140 fans to maintain very low noise level at high speeds, which is what the manufacturer claims? At the declared 1700 RPM the airflow should hit 92.4 CFM and generate no more than 36.4 dBA of noise. Static pressure is again unknown.

The paper sticker on the rotor hides the motor with a sleeve bearing that should last only 20,000 hours:

Scythe Slip Stream 140 motor also has nothing to boast, because its maximum power consumption is claimed to be 4.2 W (3.55 W according to our measurements). However, the startup voltage is the lowest of all: only 2.8 V! The junior Scythe Slip Stream 140 will most likely have higher startup voltage setting. The three-pin cable is pretty short, only 300 mm, but there is a PATA adapter with a 500 mm cable included with the fan, if you need extra length.

In conclusion we have to add that these fans are manufactured in China and are priced at $14 MSRP. They come with a 2-year warranty. Now let’s check out the test results:

Well, here is one of our today’s performance leaders: Scythe Slip Stream 140 fan. It is not only the fact that this fan has the highest rotation speed of all testing participants, but its nine crescent-shaped blades create the largest airflow at the same level of noise. In other words, Scythe Slip Stream 140 remains acoustically comfortable at up to 970 RPM (second best result) and is quiet up until its speed hits 780 RPM (first prize). There is no crackling or rustling, the motor works very quietly (at least while the fan is still new). The only sad thing is that its MTBF is so low, but the low price of the fan makes up for that matter. All in all, it is an excellent fan!

 
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