Enermax Platimax 600W

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7. COOLING & NOISE

The 14cm fan in the Platimax 600W started up at an extremely low speed, shown by a calibrated strobe to be ~325 RPM. The subjective noise was inaudible from a meter distance. Very close up (under 1'), a faint constant noise from the fan was audible, with no apparent electronic buzzing or hum. On the spectrum analyzer, the overall SPL was ~10 dBA, but it could have been lower because this is the residual noise level of the anechoic chamber. Turning the PSU on made no change in the measured noise or spectrum screen with the microphone a meter away from the PSU. To make the meter register any change when the PSu was turned on, it had to be brought to a foot distance, at which point, a broadband rise of about a decibel was seen. This is as quiet as you can get without removing or stopping the fan altogether.

The noise level did not change till around 400W load, when perhaps a single dBA increase, to 12 dBA@1m, was seen. It was still effectively inaudible. After about 5 minutes at 500W load, the fan finally sped up to perhaps 800 RPM, and the SPL stabilized around 18 dBA@1m. Amazingly, even after 10 minutes at full power (600W), the measured SPL was still only 24 dBA@1m.

With such low fan speeds, the exhaust temperature was perhaps a touch higher than with other PSUs at low loads, but the difference was irrelevant as it was still well under 30°C. Even at quite high load, 400W, when the fan started spinning up a bit, the exhaust temperature was only 32°C. The 34°C seen at 600W is low. The self-cooling ability of this Enermax is pretty amazing.

IN THE HOT BOX

When exposed to the heat of the hotbox, the Platimax 600W fan started to spin up about 100W lower, but the overall noise profile really changed very little. Even in an old-style case with poor fresh air intake for the PSU, the Platimax 600W will remain very quiet to over 400W load. This is exceptional performance.

Seasonic G360 SPL: In Hot Box vs. Out
Power load
<200W
250W
300W
400W
500W
600W
out
<10
<10
<10
12
18
24
in hot box
<10
<10
12
16
21
24
Measurements are in dBA@1m
* See note in text above.

COMPARISONS

The comparison table below shows the SPL versus Power Load data on PSUs tested in ambient room temperature, typically 20~24°C. It is most relevant when PSUs are used in cases that provide wide open access to cooler outside air for the PSU cooling fan. The Platimax 600W achieves the same silent performance as its brethren Modu/Pro87+ 500. At 600W load, it is as quiet as the best on the entire list.

PSU Noise (dBA@1m) vs. Power in Ambient Room Temperature
Model
90W
150W
200W
250W
300W
400W
500W
6-700W
850W
Kingwin Lazer Platinum LZP-550
<10*
<10
<10
<10
<10
<10
16
n/a
n/a
Seasonic X-400 Fanless
<10*
<10
<10
<10
<10
<10
n/a
n/a
n/a
Enermax Platimax 600W
<10
<10
<10
<10
<10
12
18
24
n/a
Enermax Modu/Pro87+ 500
11
11
11
11
11
11
18
n/a
n/a
Corsair AX850
<10
<10
<10
11~13
12
13
17
24
35
Seasonic X-650
<10
<10
<10
<10
<10
16
27
32
n/a
Nexus NX-5000
11
11
12
12
12.5
14
19
n/a
n/a
Antec CP-850
12
12
12
12
12
14
20
24
40
Enermax Eco80+ 500W
<11
12
12
16
20
23
28
n/a
n/a
Antec TP-750
12
12
12
14
15
27
31
40
n/a
Seasonic G360
<13
<13
18
24
34
39
n/a
n/a
n/a
Cougar GX-700
15
15
15
17
21
25
35
35
n/a

The comparison table below shows the SPL versus Power Load data on all the PSUs tested in the hotbox. It's difficult to rank them, as the measured SPL varies with power load. The units which are quietest at minimum load are not always the quietest at midload (100W~300W), which may make them louder in actual use. Then there's the noise level at 400W and up, which will determine the quietest PSUs for high power gaming rigs, during actual gaming. In this environment, the Platimax 600W essentially matches the Kingwin Platinum 550W but edges it because it has 50W higher output.

PSU Noise (dBA@1m) vs. Power in Hotbox/Anechoic Chamber
Model
90W
150W
200W
250W
300W
400W
500W
6-700W
850W
Seasonic X-400 Fanless
<10*
<10
<10
<10
<10
<10
n/a
n/a
n/a
Enermax Platimax 600W
<10
<10
<10
<10
12
16
21
24
n/a
Kingwin Lazer Platinum LZP-550
<10*
<10
<10
<10
<10
16
22
n/a
n/a
Enermax Modu/Pro87+ 500
11
11
11
11
14
20
23
n/a
n/a
Corsair AX850
<10
<10
12
15
18
25
35
38
39
Seasonic X-650
<10
<10
12
14
16
31
31
32
n/a
Nexus Value 430
11
11
16
18
18
19
n/a
n/a
n/a
Nexus NX-5000
11
11
12
14
22
24
25
n/a
n/a
Antec CP-850
12
12
12
14
14
26
40
44
45
Enermax Eco80+ 500W
<11
12
16
19
26
32
33
n/a
n/a
Seasonic M12D 850W
14
14
14
14
14
24
37
42
42
Antec TP-750
12
12
14
14
18
33
40
40
n/a
Chill Innovation CP-700M
15
15
15
15
17
30
34
34
n/a
Antec Signature 650
15
15
15
18
18
28
36
47
n/a
Coolermaster M700W
14
14
18
21
25
27
34
34
n/a
Seasonic G360
<13
17
23
30
39
39
n/a
n/a
n/a
Cougar GX-700
15
15
18
20
25
32
35
36
n/a
SilverStone DA700
18
18
18
18
23
32
35
41
n/a
Nexus RX-8500
14
14
17
22
28
32
32
33
33
NesteQ ECS7001
22
22
22
21
23
25
36
37
n/a
PCPC Silencer 610
20
24
24
24
24
30
40
50
n/a

The green boxes are >30 dBA@1m SPL.
*<10= below the ambient of our anechoic chamber; immeasurably low @1m in any environment

Caution: Please keep in mind that the data in the above table is specific to the conditions of our test setup. Change the cooling configuration, the ambient temperature and any number of other factors, and you could change the point at which the fans start speeding up, as well as the rate of the rise in speed. The baseline SPL is accurate, however, probably to within 1 dBA.



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