Coolermaster Silent Pro M700W power supply

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TEST RESULTS

Ambient conditions during testing were 21°C and 10 dBA. AC input was 121V, 60Hz. One important thing to keep in mind is that since this power supply is sold exclusively in the EU where 220~240VAC is the rule, the efficiency numbers will be 2~4% higher than our results for most users. A quick check on efficiency at 240VAC input is done on section 7 below.

OUTPUT & EFFICIENCY: Coolermaster M700W
DC Output Voltage (V) + Current (A)
Total DC Output
AC Input
Calculated Efficiency
+12V1
+12V2
+5V
+3.3V
-12V
+5VSB
12.25
0.98
-
-
5.04
0.95
3.36
0.96
0.1
0.1
21.7
33
65.8%
12.25
0.97
12.25
1.75
5.00
0.96
3.36
0.94
0.1
0.1
43.2
55
78.2%
12.25
1.87
12.25
1.74
5.02
1.88
3.35
1.79
0.2
0.4
64.1
80
80.1%
12.25
1.87
12.25
3.49
5.00
2.79
3.31
1.76
0.2
0.4
89.9
109
82.5%
12.28
4.68
12.28
3.48
4.95
5.41
3.30
5.39
0.3
0.5
151.1
180
83.9%
12.26
4.72
12.26
6.74
4.95
6.03
3.28
6.12
0.3
1.2
200.2
239
86.3%
12.28
7.62
12.28
6.71
4.92
7.84
3.27
7.88
0.4
1.4
252.3
304
84.7%
12.30
10.40
12.30
9.94
4.90
7.74
3.27
10.03
0.5
1.4
301.1
363
84.8%
12.30
11.44
12.30
12.98
4.86
12.35
3.24
12.07
0.5
1.5
400.8
492
83.3%
12.31
13.63
12.31
18.03
4.81
19.70
3.24
14.73
0.7
1.5
550.0
703
78.0%
12.30
22.00
12.30
20.06
4.80
18.20
3.22
18.10
0.8
1.5
698.6
897
77.9%
Crossload Test
12.11
22.08
12.11
23.4
5.15
0.97
3.35
0.96
0.1
0.1
560.7
679
82.6%
+12V Ripple: 62mV max @ 700W
+5V Ripple: 21mV max @ 700W
+3.3V Ripple: 17mV max @ 700W
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: Coolermaster Silent Pro M700W
Target Output (W)
20
40
65
90
150
200
250
300
400
550
700
Intake (°C)
21
21
22
23
27
33
31
33
32
38
39
Exhaust (°C)
22
23
25
29
34
41
44
48
46
61
64
Temp Rise (°C)
1
2
3
6
7
8
13
15
14
23
25
Fan (V)
4.2
4.2
4.2
4.2
4.2
4.6
5.7
7.6
8.9
12.2
12.2
SPL (dBA@1m)
14
14
14
14
14
18
25
27
30
34
34
Power Factor
0.83
0.95
0.99
0.99
0.99
0.99
0.99
0.99
0.99
0.99
0.99
AC Power in Standby: 0.3W
AC Power with no load: 5.1W
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 This is a measure of AC-to-DC conversion efficiency. The ATX12V v2.2 Power Supply Design Guide recommends 80% efficiency or better at all output power loads. 80% efficiency means that to deliver 80W DC output, a PSU draws 100W AC input, and 20W is lost as heat within the PSU. Higher efficiency is preferred for reduced energy consumption and cooler operation. It allows reduced cooling airflow, which translates to lower noise.

80% efficiency reached at a low 64W load, which represent less than 10% of rated power . This is excellent performance, better than the 80 Plus standard certification demands. as this load. The broad peak of 80~86% was reached at 64~500W, with a maximum of 86.3% at 200W. Efficiency dipped below 80% above 500W, dropping to 77.9% at full load. Overall efficiency can be regard as excellent.

2. VOLTAGE REGULATION refers to how stable the output voltages are under various load conditions. The ATX12V Power Supply Design Guide calls for the +12, +5V and +3.3V lines to be maintained within ±5%.

The voltage lines were stable, especially the 12V line, which started a bit high at 12.25V, and stayed near this level all the way to full load with no more than 0.06V variance. The 5V and 3.3V lines also stayed within spec, even at full load. The worst case was a sag of 0.2V (4%) on the 5V line at full load; hardly cause for concern.. Voltage regulation in the crossload test was very good on all lines.

3. AC RIPPLE refers to unwanted "noise" artifacts in the DC output of a switching power supply. It's usually very high in frequency (in the order of 100s of kHz). The peak-to-peak value is measured. The ATX12V Guide allows up to 120mV (peak-to-peak) of AC ripple on the +12V line and 50mV on the +5V and +3.3V lines.

Ripple was very low through most of the range, and climbed gradually as load was increased. The 62mV peak on the 12V line is very good, way below ATX12V guidelines. The 5V and 3.3V lines showed only trace amounts of ripple. at mid-power and lower, the ripple on 12V line dropped to 20mV or below, and stayed in single digits on the other lines.

4. POWER FACTOR is ideal when it measures 1.0. In the most practical sense, PF is a measure of how "difficult" it is for the electric utility to deliver the AC power into your power supply. High PF reduces the AC current draw, which reduces stress on the electric wiring in your home (and elsewhere up the line). It also means you can do with a smaller, cheaper UPS backup; they are priced according to their VA (volt-ampere) rating. PF on our sample was uniformly excellent from the lowest loads to the highest.

5. LOW LOAD PERFORMANCE is significant mainly to minimize energy waste and with system that demand very low power; the latter can cause some PSUs not to start. Standby performance excellent with just 0.3W draw. The unit powered up with no load, drawing just 5W, suggesting it will have no trouble with very low power startup/idle systems..

6. CROSSLOAD TEST - Basically the load on the 12V line was maximized while the load on all the other lines was minimized. Voltage regulation on all the lines was very good, and ripple stayed well within limits. There were no other changes.

7. 240 VAC INPUT

The power supply was set to 500W load with 120VAC through the hefty variac in the lab. The variac was then dialed 10V lower every 5 minutes. This is to check the stability of the PSU under brownout conditions where the AC line voltage drops from the 110~120V norm. Most power supplies achieve higher efficiency with higher AC input voltage. SPCR's lab is equipped with a 240VAC line, which was used to check power supply efficiency for the benefit of those who live in 240VAC mains regions.

Various VAC Inputs: M700W @400W Output
VAC
AC Power
Efficiency
244V
584W
85.6%
120V
608W
82.2%
110V
617W
81.1%
100V
627W
79.8%

There were no surprises here. Our sample's efficiency improved by ~2.5% at the higher VAC, and dropped about 1% for each 10V drop in VAC. Voltage regulation and ripple were unchanged.



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