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Stock Fan Measurements
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Specifications: Enermax ETS-T40 Stock Fan
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Manufacturer
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Power Rating
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5.4 W |
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Model Number
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PD122512MP-N
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Airflow Rating
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37.57 ~ 86.70 CFM |
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Bearing Type
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Twister (sleeve) |
Speed Rating
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800 ~ 1800 RPM |
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Corners
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Open |
Noise Rating
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10 ~ 21dBA |
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Frame Size
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120 x 120 x 25 mm |
Header Type
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4-pin |
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Fan Blade Diameter
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110 mm |
Starting Voltage
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< 5.0 V |
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Hub Size
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39 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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1930 RPM
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35~36 dBA
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9V
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1520 RPM
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28 dBA
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7V
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1060 RPM
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20 dBA
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6V
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820 RPM
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14 dBA
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5V
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580 RPM
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11~12 dBA
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Measuring mic positioned 1m at diagonal angle from
the center of the heatsink.
Ambient noise level: 10~11 dBA.
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The Twister fan's acoustics are excellent through most of its range. At 9V and above, it is very loud and fairly buzzy, a typical characteristic of sleeve bearing models. At lower speeds, it has a very smooth, pleasant sound. It is a high speed model though (our sample was 130 RPM faster than its rated speed) so it is quite loud until about the 7V / 1060 RPM level. At 5V / 580 RPM it's effectively inaudible.
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At 7V, the stock fan emits a noise level of 20 dBA@1m.
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The fan has no audible tonality, as indicated by the lack of peaks in our acoustic analysis. The noise generated is distributed fairly evenly frequency-wise, giving it a smooth broadband profile.
TEST RESULTS
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Enermax ETS-T40
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Fan Voltage
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Fan Speed
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SPL@1m
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°C Rise
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Stock Fan
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12V
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1930 RPM
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35~36 dBA
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42
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9V
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1520 RPM
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28 dBA
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43
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7V
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1060 RPM
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20 dBA
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49
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6V
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820 RPM
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14 dBA
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55
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5V
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580 RPM
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11~12 dBA
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64
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Reference Nexus 120mm Fan
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12V
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1080 RPM
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16~17 dBA
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44
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9V
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880 RPM
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13 dBA
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46
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7V
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720 RPM
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12 dBA
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50
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Reference Nexus 120mm Fan x 2
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12V
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1080 RPM
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20 dBA
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41
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9V
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880 RPM
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15 dBA
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43
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7V
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720 RPM
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13 dBA
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47
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| °C Rise: Temperature rise above ambient (20°C)
at load. |
The ETS-T40 performed well only with its stock fan at very high speeds. A large drop in performance occurred when the fan voltage was lowered below 7V. There was a 6°C increase going from 7V to 6V, and it took an additional 9°C hit at 5V. The ETS-T40 has the dishonor of being one of only a handful of heatsinks that have generated a thermal rise above ambient greater than 60°C on our testing platform. With these results alone, one might conclude that it's a terrible cooler — but that's only half-true.
When the stock fan was swapped with our trusty reference Nexus 120 mm fan, its performance picked up considerably. At 12V it emitted 16~17 dBA@1m, subjectively little more than half the noise of the stock fan's 20 dBA@1m at 7V, yet the Nexus produced a CPU temperature 5°C lower. At 9V, it was 1 dB quieter than the stock fan at 6V but the Nexus had a massive 9°C advantage. Adding a second Nexus fan improved performance by 3°C.
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Thermal compound footprint: ETS-T40 above, Hyper 212 Plus below.
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After testing, we examined the thermal compound footprint and discovered a telltale sign of poor contact between the base and CPU. The ETS-T40 had noticeable veins of TIM spread out fairly evenly on its heatpipes. Contrast this to the Cooler Master Hyper 212 Plus (the best direct-touch heatpipe cooler we've ever tested), which had only trace amounts, and much of the important copper pipe sections were virtually clear. High mounting pressure pushes most of the excess compound to the sides leaving only a faint impression behind. (Editor's Note: It's also possible that the aluminum dividers between the flattened heatpipes in the Enermax heatsink protrude just a little too far so that pressure between the heatpipes and the CPU is limited.)
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