Home / Tech News / Featured Tech News / EVGA SuperNOVA 650GS Review

EVGA SuperNOVA 650GS 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. Due to public requests we have changed our temperature settings recently – previously we rated with ambient temperatures at 25C, we have increased ambient temperatures by 10c (to 35c) in our environment to greater reflect warmer internal chassis conditions.

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
• SkyTronic DSL 2 Digital Sound Level Meter (6-130dBa)
• 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
-12V
A
V
A
V
A
V
A
V
A V
152W
2.08
3.35
2.04
5.05
10.14
12.10
0.50
5.02
0.20
-12.06
270W
3.05
3.35
3.07
5.05
19.16
12.06
0.50
5.01
0.30
-12.07
400W
4.05
3.33
5.05
5.03
29.18
11.99
1.00
5.01
0.30
-12.08
523W
6.08
3.32
7.06
5.02
38.31
11.96
1.50
5.01
0.30
-12.07
650W
8.00
3.31
9.02
4.98
48.00
11.92
2.50
5.01
0.30
-12.09

Load regulation is very good across the range, with only a little deviation.

EVGA SuperNOVA 650GS
Maximum Load
722W

The power supply would shut down at 722W, gracefully. The protection circuitry worked well.

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.

Cross Load Testing +3.3V +5V +12V -12V +5VSB
A V A V A V A V A V
590W 1.0 3.34 1.0 5.04 48.0 11.88 0.2 -12.05 0.50 5.02
145W 12.0 3.28 15.0 4.96 2.0 12.12 0.2 -12.01 0.50 5.01

Cross load results are good, with all rails holding within stable limits.

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 unit complied with the ATX standard.

AC Ripple (mV p-p)
DC Load +3.3V +5V +12V 5VSB
152W 5 5 10 5
270W 5 5 15 5
400W 5 5 20 5
523W 10 5 30 10
650W 10 10 45 10

Ripple suppression is excellent. the minor rails hold between 5mV and 10mV. The +12V rail peaks at 45mV, well within the maximum rated specifications.

Efficiency (%)
152W
87.54
270W
91.89
400W
90.73
523W
89.44
650W
88.84

Efficiency is strong, peaking at just over 92 percent around 50 percent load. This drops to (close to) 89 percent efficiency at full load.

We take the issue of noise very seriously at KitGuru and this is why we have built a special home brew system as a reference point when we test noise levels of various components. Why do this? Well this means we can eliminate secondary noise pollution in the test room and concentrate on components we are testing. It also brings us slightly closer to industry standards, such as DIN 45635.

Today to test the Power Supply we have taken it into our acoustics room environment and have set our SkyTronic DSL 2 Digital Sound Level Meter (6-130dBa) one meter away from the unit. We have no other fans running so we can effectively measure just the noise from the unit itself.

As this can be a little confusing for people, here are various dBa ratings in with real world situations to help describe the various levels.

KitGuru noise guide
10dBA – Normal Breathing/Rustling Leaves
20-25dBA – Whisper
30dBA – High Quality Computer fan
40dBA – A Bubbling Brook, or a Refrigerator
50dBA – Normal Conversation
60dBA – Laughter
70dBA – Vacuum Cleaner or Hairdryer
80dBA – City Traffic or a Garbage Disposal
90dBA – Motorcycle or Lawnmower
100dBA – MP3 Player at maximum output
110dBA – Orchestra
120dBA – Front row rock concert/Jet Engine
130dBA – Threshold of Pain
140dBA – Military Jet takeoff/Gunshot (close range)
160dBA – Instant Perforation of eardrum

Noise (dBA)
152W
<28.0
270W
<28.0
400W
32.3
523W
34.8
650W 36.3

The power supply is not audible until around 450 watts is demanded. This rises a little further, rating at 36.3dBa under full load conditions. It is clearly audible when spinning fast, but actually quite a dull pitch and likely to be drowned out by case fans.

Temperature (c)
Intake
Exhaust
152W
36
42
270W
39
49
400W
42
51
523W
43
55
650W
45
61

At full load exhaust temperature was hitting 61c.

Maximum load
Efficiency
722W
87.89

Pushing the power supply above its rated limits generates an ultimate efficiency level of around 87.89%. This is not a viable ‘real world’ situation, but it is interesting nonetheless.

Become a Patron!

Check Also

Microsoft commits to at least 3 years of Android updates for Surface Duo

The Surface Duo, Microsoft’s first Android-powered smartphone, is coming out in just over one month. …