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Antec Truepower 750W New Series Review

Additional technical assistance: Peter McFarland and Jeremy Price.

Correctly testing power supplies is a complex procedure and KitGuru have configured a test bench which can deliver up to a 2,000 watt DC load. Over the coming months this configuration is likely to be adjusted further and fine tuned.

We use combinations of the following hardware:
•  SunMoon SM-268
•  CSI3710A Programmable DC load (+3.3V and +5V outputs)
•  CSI3711A Programmable DC load (+12V1, +12V2, +12V3, and +12V4)
•    Extech Power Analyzer
•    Extech MultiMaster MM570 digital multimeter
•    Extech digital sound level meter
•    Digital oscilloscope (20M S/s with 12 Bit ADC)
•    Variable Autotransformer, 1.4 KVA

DC Output Load Regulation

Combined

DC Load

+3.3V
+5V
-12V
+5VSB
A
V
A
V
A
V
A
V
75W
1.20
3.35
1.16
5.08
0.2
-11.71
0.5
5.05
150W
2.17
3.38
2.75
5.08
0.3
-11.69
1.0
5.02
375W
6.04
3.35
5.86
5.08
0.5
-11.76
1.5
4.98
565W
10.05
3.33
10.65
4.99
0.6
-11.85
2.0
4.97
750W
10.45
3.31
13.55
4.98
0.8
-11.85
3.0
4.88
DC Output Load Regulation
Combined DC Load
+12V1
+12V2
+12V3
+12V4
A
V
A
V
A
V
A
V
75W
1.25
12.17
1.25
12.12
1.23
12.11
1.24
12.11
150W
2.49
12.12
2.49
12.05
2.48
12.10
2.48
12.11
375W
6.47
12.08
6.53
11.95
6.47
12.07
6.49
12.01
565W
9.65
11.92
9.68
11.82
9.58
11.92
9.65
11.93
750W
13.20
11.86
13.27
11.78
13.19
11.87
13.25
11.82

The Antec 750W psu is able to deliver solid load regulation on all of the outputs throughout our varied load tests – even when fully loaded, which would be outside normal parameters for the average punter. We were impressed with the primary rail results as well as they fall close to reference results.

Next we want to try Cross Loading. This basically means loads which are not balanced. If a PC for instance needs 500W on the +12V outputs but something like 30W via the combined 3.3V and +5V outputs then the voltage regulation can fluctuate badly.

Combined DC Load +3.3V +5V +12V -12V +5VSB
A V A V A V A V A V
725W 1.0 3.36 1.0 5.07 60.0 11.75 0.2 -12.00 0.5 4.96
200W 17.8 3.29 20.0 4.91 2.0 12.18 0.2 -11.88 0.5 4.94

As we had expected the TruePower PSU has no problems with the cross loading stress testing which is helped by the fact it creates the +3.3V and +5V feed using DC to DC converters. All the readings are well within specification and we were happy with the end result.

We then used an oscilloscope to measure AC ripple and noise present on the DC outputs. We set the oscilloscope time base to check for AC ripple at both high and low ends of the spectrum.

ATX12V V2.2 specification for DC output ripple and noise is defined in the ATX 12V power supply design guide.

ATX12V Ver 2.2 Noise/Ripple Tolerance
Output
Ripple (mV p-p)
+3.3V
50
+5V
50
+12V1
120
+12V2
120
-12V
120
+5VSB
50

Obviously when measuring AC noise and ripple on the DC outputs the cleaner (less recorded) means we have a better end result. We measured this AC signal amplitude to see how closely the Antec unit complied with the ATX standard.

AC Ripple (mV p-p)
DC Load +3.3V +5V +12V1 +12V2 +12V3 +12V4 5VSB
75W 10 10 10 10 10 10 15
150W 15 15 15 15 15 15 15
380W 15 15 10 10 10 10 10
565W 15 20 20 20 20 20 20
750W 25 20 24 25 25 20 20

Again we are more than happy with these results as the ripple suppression is top drawer on all the outputs.

Efficiency (%)
100w
82.1
200w
87.3
400w
88.5
575w
87.5
750w
86.2

The 750W Antec TruePower is clearly a very efficient PSU. The unit peaked at 88.5% around 400W and we never saw it dropping under 80w, even with a minor load of 100W.

Noise (dBA)
100w
28.5
200w
28.8
400w
29.1
575w
32.1
750w
35.2

The noise levels are excellent with the supply being virtually inaudible below 500w. Once 550w load is reached then the fan starts to speed up and it becomes an audible whisper. At full load the noise levels are clearly heard but it never becomes annoying.

Exhaust Temperature (c)
100w
25.2
200w
25.9
400w
28.5
575w
36.6
750w
44.1

This is a very cool running PSU even when loaded at 450W. Over 500W the temperatures start to rise although they are still very good. A full load result of 44.1c is excellent and is one of the better results we have recorded.

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