Rosewill Silent Night 500 Platinum 80 Plus

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7. COOLING

The temperatures marked in the main test results table need some explanation. Normally, for a fan-cooled PSU, a thermal sensor is moved around a bit during warmup at ~200W load to find the "hot spot" on the exhaust grill where is attached using friction. This provides consistent enough readings of the exhaust air temperature. With a fanless PSU, there is no force airflow, so where should the sensor go? For the Rosewill Silent Night 500, it was placed on the back panel grill, on the edge od the heatsink panel. This temperature data is probably not very useful. To be honest, without an array of thermal sensors placed at many spots all around the interior, monitoring the temperature of a fanless PSU is futile. In any case, the unit did not suffer any temperature overload shutdown during the testing, even at full load when the outer casing temperature exceeded 50°C in a couple of spots.

8. NOISE

No noise of any kind was heard or detected at low load in the anechoic chamber with the microphone a meter away. Even from virtually inches away, not even a trace amount of whine or buzz could be reliably heard; a noise might have been there, but it was below my threshold of hearing sensitivity.

The noise was checked repeatedly as load was increased. At around the 200W load, a trace level of buzzing became audible from inches away, but too low in level to be at all significant in any application. It was inaudible from a foot away, nor was it measurable; ie, it was below the 10 dBA ambient noise floor of the chamber.

This trace buzz did continue to rise proportionately with increased load so that at full load (500W), the buzz was just barely audible from a meter away, and registered about a 1 dB rise in sound pressure level (SPL), to perhaps 11.5~12 dBA @1m. Most of the buzz was centered around 300Hz, like the Kingwin version tested before. In normal use, this would still be inaudible unless the PSU was working in a super quiet environment and in a system without any other noise sources (like fans), which would be quite a feat if the components were drawing 500W — that's too much heat to be disspated without forced airflow unless you've got some custom-built, massive, passive heatsink/case.

The Rosewill Silent Night 500 is effectively silent as claimed. It is a bit quieter at full load than the Kingwin STR-500 sample tested 18 months ago.

COMPARISONS

The comparison table below shows the SPL versus Power Load data on PSUs tested in ambient room temperature, typically 20~24°C. By SPL at 1m, only the Seasonic 520 Platinum Fanless tops it at full load, but that model has a history of somewhat more significant electronic noise.

PSU Noise (dBA@1m) vs. Power in Ambient Room Temperature
Model
90W
150W
200W
250W
300W
400W
500W
6-700W
850W
Seasonic 520 Platinum
<11
<11
<11
<11
<11
<11
<11
n/a
n/a
Rosewill Silent Night 500
<11*
<11
<11
<11
<11
<11
12
n/a
n/a
Kingwin Lazer Platinum LZP-550
<11*
<11
<11
<11
<11
<11
16
n/a
n/a
bequiet! DPP 10 550W
<11
<11
<11
<11
<11
12
15
n/a
n/a
Seasonic X-400 Fanless
<11*
<11
<11
<11
<11
<11
n/a
n/a
n/a
Enermax Platimax 60v0W
<11
<11
<11
<11
<11
12
18
24
n/a
Enermax Modu/Pro87+ 500
11
11
11
11
11
11
18
n/a
n/a
Corsair AX850
<11
<11
<11
11~13
12
13
17
24
35
Seasonic X-650
<11
<11
<11
<11
<11
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
CoolerMaster Silent Pro M2 720W
15
15
15
15
15
16
22
31
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 differently 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. Again only the Seasonic 520 Platinum edges the Rosewill Silent Night 500, and this assumes the Seasonic is free of electronic noise.

PSU Noise (dBA@1m) vs. Power in Hotbox/Anechoic Chamber
Model
90W
150W
200W
250W
300W
400W
500W
6-700W
850W
Seasonic 520 Platinum
<11
<11
<11
<11
<11
<11
<11
n/a
n/a
Rosewill Silent Night 500
<11*
<11
<11
<11
<11
<11
12
n/a
n/a
Seasonic X-400 Fanless
<11*
<11
<11
<11
<11
<11
n/a
n/a
n/a
bequiet! DPP 10 550W
<11
<11
<11
<11
<11
13
22
n/a
n/a
Enermax Platimax 600W
<11
<11
<11
<11
12
16
21
24
n/a
Kingwin Lazer Platinum LZP-550
<11*
<11
<11
<11
<11
16
22
n/a
n/a
Enermax Modu/Pro87+ 500
11
11
11
11
14
20
23
n/a
n/a
Corsair AX850
<11
<11
12
15
18
25
35
38
39
Seasonic X-650
<11
<11
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
CoolerMaster Silent Pro M2 720W
15
15
15
15
16
21
25
32
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.
*<11 or 11= 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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