Enermax ETS-T40: Direct-Touch Heatpipe Cooler

Cooling
Viewing page 5 of 6 pages. Previous 1 2 3 4 5 6 Next

Stock Fan Measurements

Specifications: Enermax ETS-T40 Stock Fan
Manufacturer
Power Rating
5.4 W
Model Number
PD122512MP-N
Airflow Rating
37.57 ~ 86.70 CFM
Bearing Type
Twister (sleeve)
Speed Rating
800 ~ 1800 RPM
Corners
Open
Noise Rating
10 ~ 21dBA
Frame Size
120 x 120 x 25 mm
Header Type
4-pin
Fan Blade Diameter
110 mm
Starting Voltage
< 5.0 V
Hub Size
39 mm
Weight
120 g
Data in green cells provided by the manufacturer or observed; data in the blue cells were measured.

Stock Fan Measurements
Voltage
Speed
SPL@1m
12V
1930 RPM
35~36 dBA
9V
1520 RPM
28 dBA
7V
1060 RPM
20 dBA
6V
820 RPM
14 dBA
5V
580 RPM
11~12 dBA
Measuring mic positioned 1m at diagonal angle from the center of the heatsink.
Ambient noise level: 10~11 dBA.

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.


At 7V, the stock fan emits a noise level of 20 dBA@1m.

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

Enermax ETS-T40
Fan Voltage
Fan Speed
SPL@1m
°C Rise
Stock Fan
12V
1930 RPM
35~36 dBA
42
9V
1520 RPM
28 dBA
43
7V
1060 RPM
20 dBA
49
6V
820 RPM
14 dBA
55
5V
580 RPM
11~12 dBA
64
Reference Nexus 120mm Fan
12V
1080 RPM
16~17 dBA
44
9V
880 RPM
13 dBA
46
7V
720 RPM
12 dBA
50
Reference Nexus 120mm Fan x 2
12V
1080 RPM
20 dBA
41
9V
880 RPM
15 dBA
43
7V
720 RPM
13 dBA
47
°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.



Thermal compound footprint: ETS-T40 above, Hyper 212 Plus below.

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.)



Previous 1 2 3 4 5 6 Next

Cooling - Article Index
Help support this site, buy from one of our affiliate retailers!
Search: