Nexus NX-8060 ATX power supply

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TEST RESULTS

Ambient conditions during testing were 21°C and 18 dBA. AC input was 121V, 60Hz.

OUTPUT & EFFICIENCY: Nexus NX8060
DC Output Voltage (V) + Current (A)
Total DC Output
AC Input
Calculated Efficiency
+12V1
+12V2
+5V
+3.3V
-12V
+5VSB
12.12
0.97
12.12
1.72
5.15
1.01
3.35
0.96
0.1
0.2
43.0
62
69.0%
12.09
1.89
12.09
1.72
5.13
1.99
3.35
0.96
0.1
0.3
62.6
85
73.5%
12.07
1.89
12.08
3.27
5.14
1.98
3.35
0.96
0.1
0.4
89.0
115
77.4%
12.08
3.82
12.08
4.99
5.08
4.63
3.32
1.80
0.2
0.6
150.4
186
80.8%
12.08
5.65
12.06
6.45
5.08
4.60
3.30
4.60
0.3
0.8
201.3
241
83.5%
12.06
8.43
12.06
6.45
5.01
8.67
3.30
6.26
0.3
1.0
249.6
300
83.2%
12.06
8.43
12.06
9.43
4.92
9.80
3.30
8.30
0.3
1.2
296.1
356
83.2%
12.06
13.08
12.06
12.95
4.81
14.60
3.28
14.83
0.6
1.9
449.2
548
82.0%
12.01
14.75
12.01
20.7
4.78
19.35
3.28
19.06
08
2.5
599.7
756
79.3%
Crossload Test
12.01
12.60
11.98
33.6
4.91
0.97
3.32
0.95
0.1
0.2
558.2
699
79.8%
+12V Ripple: 18.9mV max @600W
+5V Ripple: 11.1mV max @ 600W
+3.3V Ripple: 8.4mV max @ 600W
NOTE: The current and voltage for -12V and +5VSB lines is not measured but based on switch settings of the DBS-2100 PS Loader. It is a tiny portion of the total, and potential errors arising from inaccuracies on these lines is <1W.

OTHER DATA SUMMARY: Nexus NX8060
DC Output (W)
43.0
62.6
89.0
150.4
201.3
249.6
296.1
449.2
599.7
Intake (°C)
25
26
26
29
29
30
31
35
38
Exhaust (°C)
30
31
31
36
39
40
42
51
62
Temp Rise (°C)
5
5
5
7
10
10
11
16
24
Fan Voltage (V)
4.3
4.6
5.0
5.8
6.4
7.1
7.3
10.5
11.5
SPL (dBA@1m)
21
24
26
27
29
32
33
38
42
Power Factor
0.82
0.91
0.97
0.98
0.99
0.99
1.00
1.00
1.00
AC Power in Standby: 0.3W
AC Power with No Load, PSU power On: 8.3W / 0.62 PF
NOTE: The ambient room temperature during testing can vary a few degrees from review to review. Please take this into account when comparing PSU test data.


ANALYSIS

1. EFFICIENCY was very good. At 40W~65W, it was fairly typical of recent high efficiency PSUs rated at >500W, starting low but climbing fast. The 80% mark was reached somewhere between 90W and 150W output.

If we are to consider this PSU as being 80 Plus certified, then it must be 80% efficient or better at 20%, 50% and 100% of rated output. To give Nexus the benefit of a doubt, we can accept that 80% efficiency could have been reached at the 120W mark, which is 20% of the rated 600W output. The peak of >83% was reached around 200W, and it stayed at this level up to near 400W, where it began dropping off. It just fell shy of 80% at full load, but it missed by less than a percentage point, which is probably beyond the accuracy resolution of our test system. At 240VAC input, the efficiency rose slightly by a maximum of about 2% at the peak.

2. VOLTAGE REGULATION was excellent under all loads. All the voltage lines were extremely stable, especially the 12V line, which barely drooped even at full load.

3. RIPPLE was modest, well within requirements.

4. POWER FACTOR was excellent at all loads. It was a little low at very low loads, but quickly rose to near the theoretical best.

5. LOW LOAD PERFORMANCE

Standby and no-load performance were both excellent, with no load coming in at under 10W. The NX-8060 had no trouble starting with no load.

6. LOW AC VOLTAGE PERFORMANCE

Low VAC Test: NX-8060 @ 450W Output
VAC
AC Current
AC Power
Efficiency
120V
5.08A
548W
82.0%
110V
5.53A
553W
81.4%
100V
6.12A
557W
80.8%
90V
6.92A
565W
79.4%
80V
6.92A
576W
78.1%

The NX-8060 was hardly affected by low AC voltage inputs, even down to 80VAC at 75% of rated output; it's only rated for operation at 100~240VAC. Ripple stayed well within limits and voltages were stable at all times. The unit should have no trouble dealing with brownouts.

7. TEMPERATURE & COOLING

Up to around 300W, the NX-8060 kept itself reasonably cool, with a temperature rise of 5~11°C. By 450W output, the temperature rise reached 16°C, and at full load, it went up to 24°C. Our PC system simulation thermal box feeds all of the heat of the PSU's output through the box, just like in a real system, so that we can see how the PSU's fan and cooling system would behave in a real system. Neither of these temperatures are of any real concern, as there was no indication of overheating causing performance deterioration (usually, output power and/or voltage reduction over time).

8. FAN, FAN CONTROLLER and NOISE

The starting speed of the fan was approximately 3.8V. The measured sound pressure level was just under 20 dBA@1m, as Nexus claims. However, even at 40W load, the fan ramped up a bit almost immediately and kept climbing until it stabilized at 4.3V, where the noise measured 21 dBA. At the fairly typical system idle power load of 65W, the fan had sped up enough to the point where it measured a clearly audible 24 dBA. The sound quality was smooth, as expected of this familiar fan.

Nexus gives details about its acoustic testing in a 3 x 3 x 2 meter anechoic chamber, and this transparency is very admirable. But the test is conducted with the PSU in the open and the ambient temperature is not given. On the basis of our testing, the ambient temperature had to be no higher than our 21°C, and the PSU "idle" noise was measured in the open whie running at near-zero load. It's the only way that "19.6 dBA at idle" could be claimed.

Nexus also shows a graph showing a slow rise in sound pressure level as the load is increased. Again, this must be showing the performance in open air at a modest ambient temperature, because the slope noise increase is much shallower than our findings.


Graph of noise / load from Nexus; the ambient temperature is probably constant, at normal room level.

In our thermally realistic test, the fan speed / noise rose linearly in accordance with increases in heat / load. The fan voltage and noise rose steadily, and by a modest 150W load, it reached 5.8V and 27 dBA@1m. At 250W load, the noise reached 32 dBA, which is beyond our ">30 dBA@1m is not quiet" limit. In the graph below, you can compare our data with that from the Nexus graph.

The graph above dramatically illustrates the difference between testing a PSU's noise / power at room temperature in open air... versus actual operation inside a real PC (which our thermal test box simulates closely). What SPCR's test shows is that in a normal PC environment where the PSU will be subject to at least some of the heat from other components, the noise of the NX-8060 will not be much of a factor at idle and low loads; ambient room noise, and noises from other components will tend to merge together. Above ~150W load, however, the PSU will become an increasingly audible source of noise. It is a good candidate for use in the Antec P180/P182 case where the PSU is thermally isolated in its own cooling zone. (Note: We noticed no ramping up of noise from the Nexus NX-8060 when it was used in a recent review of the AntecP182.)



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