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Stock Fan Measurements
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Specifications: Scythe 3 & Yasya Stock Fan
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Manufacturer
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Power Rating
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7.2W |
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Model Number
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SY1225SL12HPVC
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Airflow Rating
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110.31 CFM |
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Bearing Type
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Sleeve |
Speed Rating
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1900 RPM |
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Corners
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Open |
Noise Rating
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37 dBA |
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Frame Size
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120 x 120 mm |
Header Type
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4-pin PWM |
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Fan Blade Diameter
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114 mm |
Starting Voltage
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4.1V |
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Hub Size
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36 mm |
Weight
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120 g |
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Data in green cells provided by the manufacturer
or observed; data in the blue cells were measured.
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Stock Fan Measurements
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Voltage
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Speed
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SPL @1m
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12V
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1920 RPM
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36 dBA
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9V
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1580 RPM
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30 dBA
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7V
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1350 RPM
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26 dBA
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5V
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1030 RPM
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18 dBA
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4V
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800 RPM
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13 dBA
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Measuring mic positioned 1m at diagonal angle from
the intake side of the fan.
Ambient noise level: 11 dBA.
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The Ninja 3 and Yasya stock fan has a much higher speed than the fans on most
of Scythe's previous coolers but it is still a Slip Stream, so smooth, unobtrusive
sound can be obtained through undervolting. At 9V and above, the fan produces
a distressing amount of whine and turbulence. At 7V the whine lessens, but the
turbulence remains, and the fan gives off an audible hum. At 5V, the fan becomes
what we consider to be quiet — 18 dBA@1m, with a smooth broadband profile
with just a slight rattle audible at one meter. At 4V, its acoustics are beyond
reproach; there are few fans if any that sound as good generating 13 dBA@1m.
The fan has a starting voltage of 4V, which is also the bottom limit of the
included fan controller. However, when combined with PWM control on a capable
motherboard, the speed can be dropped down to about 400 RPM, though there is
little practical reason to slow it down that much.
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The Ninja 3/Yasya stock fan measures 18 dBA@1m when running at 5V.
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COOLING RESULTS
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Stock 120mm fan
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Fan Voltage
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SPL@1m
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°C Rise
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Ninja 3
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Yasya
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12V
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36 dBA
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39
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36
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9V
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30 dBA
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40
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37
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7V
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26 dBA
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41
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38
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5V
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18 dBA
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44
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40
|
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4V
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13 dBA
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46
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43
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Reference 120mm fan
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12V
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16 dBA
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44
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41
|
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9V
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13 dBA
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47
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43
|
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7V
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12 dBA
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49
|
47
|
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2 x Reference 120mm fans
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|
12V
|
19 dBA
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41
|
39
|
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9V
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14 dBA
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43
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40
|
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7V
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12 dBA
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46
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43
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| °C Rise: Temperature rise above ambient (26°C)
at load. |
When paired either the stock fan and our reference fan, the Yasya consistently
held a 2~4°C lead over the larger Ninja 3. Though the Yasya has a less impressive
mounting system, we found that the thermal compound footprint (examined when
the heatsink was removed after testing) showed signs of a tighter mating, and
was more even all around, probably due to its slightly convex base. We believe
this played a significant factor in the Yasya's superior performance.
Pairing the heatsinks with dual reference fans produced similar improvements
with a 2~3°C drop in temperature at 12V and a 3~4°C dip at 9V and 7V.
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