Silverstone SX600-G: SFX 80+ Gold PSU

Power
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7. COOLING

The temperatures measured for this unit during operation seem lower than usual. 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. For whatever reason, the exhaust air never seemed to get that high. It's important to note, however, that the semi-passive fan, which is tied to an internal temperature of 45°C in a sensor somewhere inside the unit, started at just 40W load after about 15 minutes, when the exhaust temperature read only 26°C.

8. NOISE

No noise of any kind was heard or detected at 20W load in the anechoic chamber with the microphone a meter away. Even from virtually inches away, only a trace amount of buzz could be reliably heard.

The fan started spinning at a much lower power load and external temperature than expected, as detailed in section 7. Once the fan began spinning, it did not stop at any time during testing, even after switching on/off; presumably the internal sensor to which the fan operation is tied never had a chance to cool off below 45°C.

The minimum noise of the fan measured about 14.5 dBA @ 1m. This is very quiet, likely inaudible in most installations. The quality of the noise was not entirely smooth, however, as the 80mm fan exhibited a small degree of tonality and some periodic clicking. Again, the volume was at a low enough level that this should not be considered significant for most users, even among SPCR's highly sensitive audience.


The SX600-G frequency spectrum at low loads.

The fan speed did not appear to increase until around 200W load, when it slid up to 19 dBA. The sound quality was actually a bit smoother than at the lowest speed, as most of the periodic noises had disappeared, and the primary component was the broadband woosh of airflow.

From this point on up, the fan speed/noise rose more or less in sync with power load. 300W saw a 10 dBA jump, but then beyond that, the noise level rose 7 dBA to a maximum of just under 35 dBA at 500W. This level did not change all the way to full power. 35 dBA @ 1m is plainly audible, but the quality of the noise is relatively benign, being a fairly smooth broadband noise with little or no tonality.


This is the frequency spectrum at 500W+ loads.

Overall, the noise performance is not quite as good as one of SPCR's top-rated ATX power supplies, which benefit from 120mm or larger fans, but the SX600-G is still a very quiet power supply, certainly to ~200W load. Above that power level, it becomes increasingly and plainly audible but not highly intrusive, due to the relatively smooth quality of the noise. There's very little or no electronic noise (such as buzz, hum or whine) to be perceived.

9. COMPARISONS

The comparison table below shows the SPL versus Power Load data on PSUs tested in ambient room temperature, typically 20~24°C. The Silverstone SX600-G is the lone SFX PSU on this table, and the only one with an 80mm fan; naturally it falls to the bottom. However, note that while not quite as quiet at very low load, above ~250W, it actually runs significantly quieter than the Seasonic G360.

PSU Noise ([email protected]) 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
Silverstone SX600-G (SFX)
15
16
19
n/a
29
32
35
35
n/a

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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