EVGA SuperNOVA 1600 P2 Power Supply Review

Efficiency, Temperatures And Noise

Efficiency

Using the results from the previous page, we plotted a chart showing the efficiency of the 1600 P2 at low loads and at loads equal to 10 percent to 105 percent of the PSU's maximum capacity.

The 1600 P2 is a highly efficient PSU even under light loads, which definitely aren't the favorite playground for such high-capacity units. With 115V input, the unit registers a higher average score in the low-load range (20-80W). However, with higher loads the situation turns in favor of 230V. Also, at both light and normal loads, the 1600 P2 easily takes the lead from its Gold-rated sibling (1600 G2). It loses only to the Titanium-rated Corsair AX1500i in 20 to 100 percent of its max-rated capacity load. If we take into account that the AX1500i is an almost fully digitally-controlled unit while the Super Flower platform is based on analog circuits, this is quite a feat. Who said that analog circuits don't have anything left to offer?

Efficiency at Low Loads

In the next tests, we measure the efficiency of the 1600 P2 at loads significantly lower than 10 percent of the device's maximum (the lowest load the 80 PLUS standard measures). The loads we dialed were 20, 40, 60 and 80W. This is important for representing when a PC is idle with power-saving features turned on.

Efficiency at Low Levels
EVGA SuperNOVA 1600 P2
Test #
12V
5V
3.3V
5VSB
DC/AC Watts
Efficiency
Fan Speed (RPM)
Fan Noise (dB[A])
PF/AC Volts
1
1.192A
0.491A
0.480A
0.196A
19.66
57.17%
0
0 dB(A)
0.820
12.239V
5.059V
3.323V
5.057V
34.39
115.1V
2
2.409A
0.979A
0.991A
0.396A
39.72
72.04%
0
0 dB(A)0.899
12.236V
5.058V
2.323V
5.025V
55.14
115.0V
3
3.629A
1.476A
1.505A
5.048A
59.84
78.23%
0
0 dB(A)0.931
12.234V
5.057V
3.321V
5.048V
76.49
115.0V
4
4.840A
1.973A
1.985A
0.790A
79.75
82.36%
0
0 dB(A)0.951
12.232V
5.055V
3.320V
5.042V
96.83
115.0V

At only 20W, efficiency drops below 60 percent. In the remaining two tests, it climbs above 70 percent. However, only during the last test and under an 80W load does it manage to surpass the 80-percent mark. For a 1600W beast, it does well. Best of all, during the entire light-load test session, the PSU operated in fanless mode.

5VSB Efficiency

The ATX specification states that 5VSB standby supply efficiency should be as high as possible, recommending 50 percent or higher efficiency with 100mA of load, 60 percent or higher with 250mA of load and 70 percent or higher with 1A or more of load.

We took four measurements: one each at 100, 250 and 1000mA, and one with the full load the 5VSB rail can handle. 

5VSB Efficiency
EVGA SuperNOVA 1600 P2
Test#
5VSB
DC/AC Watts
Efficiency
PF/AC Volts
1
0.102A
0.52
70.27%
0.040
5.058V
0.74
115.2V
2
0.252A
1.27
74.71%
0.08
5.054V
1.70
115.7V
3
1.003A
5.06
79.31%
0.265
5.014V
6.38
115.4V
4
3.002A
15.01
78.83%
0.434
5.001V
19.04
115.3V

In our opinion, the 5VSB circuit isn't worthy of this high-end platform. It is efficient enough for a mid-level PSU, but in a Platinum-rated model, we would like to see readings above 80 percent in the last two tests. On top of that, the SuperNOVA 1600 P2 deserves a stronger 5VSB rail with at least 4A of current output.

Power Consumption In Idle And Standby

Idle / Standby
EVGA SuperNOVA 1600 P2
Mode
12V
5V
3.3V
5VSB
Watts
PF/AC Volts
Idle
12.243V
5.060V
3.325V
5.062V
12.92
0.524
115.3V
Standby




0.13
0.007
115.4V

In the table above, you find the power consumption and voltage values of all rails (except -12V) when the PSU is in idle mode (powered on, but without any load on its rails), and the power consumption when the PSU is in standby mode (without any load at 5VSB).

Phantom power is low using 115V and a little higher with 230V input. However, in both cases, the 1600 P2 easily meets the ErP Lot 6 2013 requirements.

Fan RPM, Delta Temperature And Output Noise

The following chart illustrates the cooling fan's speed (RPMs) and the delta between input and output temperature. The results were obtained at 38 to 45 degrees C ambient temperature.   

This next chart shows the cooling fan's speed (RPMs) and output noise. We measured acoustics from one meter away, inside a small, custom-made anechoic chamber with internals completely covered in soundproofing material (be quiet! Noise Absorber kit). Background noise inside the anechoic chamber was below 20 dB(A) during testing, and the results were obtained with the PSU operating at 38 to 45 degrees C ambient temperature. 

The following graph illustrates the fan's output noise over the entire operating range of the PSU. The same conditions of the above graph apply to our measurements, though the ambient temperature was between 28 and 30 degrees C.

As you can see from the graph above, at normal operating conditions the PSU "runs" in passive mode for a pretty long period. At around 550W, the fan engages at low speed. After it exhausts most of the waste heat it switches to passive mode again. Afterward, the fan spins at low RPM up to about 1500 W. And when things get really tough, it switches to a higher speed—around 1500 RPM, according to our tests. This unit manages to combine two attributes that usually don't get along: high power and quiet operation.

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25 comments
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  • damric
    Good review, but missing the hot box testing to see if this thing regulates and suppresses ripple at 50C as advertised.
  • Aris_Mp
    All tests were conducted at high ambient temperatures which during full load were above 47C. Only the Cross-Load tests were conducted at 28-30C.
  • SinxarKnights
    I appreciate the detailed review.
  • Giannis Karagiannis
    Very detailed review indeed. There isn't really anything that could be covered and it is not. I don't think that there are many PSU manufacturers out there that can test their products so extensively.
  • Dark Lord of Tech
    Too light for me I have the 2000w coming from Dabs when it comes to retail.
  • Aris_Mp
    I had the opportunity to test the 2 kW model (from Super Flower) and it is indeed superb. But it will provide 2 kW only with 230 VAC input since a normal socket can deliver only up to 15 A of current.
  • damric
    276663 said:
    Too light for me I have the 2000w coming from Dabs when it comes to retail.


    Where are you from that you need all that power? Cybertron?
  • damric
    1903369 said:
    All tests were conducted at high ambient temperatures which during full load were above 47C. Only the Cross-Load tests were conducted at 28-30C.


    47C ambients? Must have been sweating your language, please off, or you are language, please me.
  • Dark Lord of Tech
    I'm going to power my Skynet build with it.
  • damric
    276663 said:
    I'm going to power my Skynet build with it.


    One day you need to show us a picture of everything. I've seen little snapshots here and there, but I'd like to see it all in one thread.
  • Dark Lord of Tech
    I'm starting a white and black build , a Snow Beast , next week.
  • damric
    With the Krait motherboard? Or is there another white/black?
  • Dark Lord of Tech
    No way this one.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16813132414
  • damric
    Oh wow I haven't seen that yet.
  • Aris_Mp
    410076 said:
    1903369 said:
    All tests were conducted at high ambient temperatures which during full load were above 47C. Only the Cross-Load tests were conducted at 28-30C.
    47C ambients? Must have been sweating your language, please off, or you are language, pleaseing me.


    The PSU is inside a special-made box (hot-box) for the high temp tests.
  • Dark Lord of Tech
    Sweet board going to order it on monday.
  • damric
    1903369 said:
    410076 said:
    1903369 said:
    All tests were conducted at high ambient temperatures which during full load were above 47C. Only the Cross-Load tests were conducted at 28-30C.
    47C ambients? Must have been sweating your language, pleaseoff, or you are language, pleaseing me.
    The PSU is inside a special-made box (hot-box) for the high temp tests.


    Wouldn't your FLIR show that the box is hot?
  • Aris_Mp
    no point since the box is insulated so from the outside the temperature will be lower. Also if i open the lid to take a snapshot with FLIR the temperature will drop immediately by 5 C at least (ambient) messing with the test.

    I already know what happens inside the box thanks to two temperature probes I have installed in it, so no need to use my FLIR on it. However on next review I will try it.
  • damric
    1903369 said:
    no point since the box is insulated so from the outside the temperature will be lower. Also if i open the lid to take a snapshot with FLIR the temperature will drop immediately by 5 C at least (ambient) messing with the test. I already know what happens inside the box thanks to two temperature probes I have installed in it, so no need to use my FLIR on it. However on next review I will try it.


    Fair enough. It will be excellent when Tom's Hardware adopts a consistent review standard. Yours was one of the best PSU reviews yet. There's other nitpicks I have but they are nothing major like chart/graph formats could be easier to read.

    In your opinion everything held up in close to 50C conditions then?
  • loki1944
    Nice, if I ever go 3-4 way SLI I'll upgrade to this from my 1300W G2.
  • ykki
    Quote:
    I'm going to power my Skynet build with it.

    Dont forget the OFF switch. Arnold is a busy man.
  • Aris_Mp
    "In your opinion everything help up in close to 50C conditions then?"

    around 45C is much more realistic. 50C are too much for modern chassis. However when needed I crank up the heat inside my hot box to see how the PSU performs. Like in this case that I deliberately exceeded my usual 45C and went to almost 48.
  • g00ey
    The "Power Specifications" table on the second page is wrong. The third line must be "Maximum Watts" and not "Maximum Volts". Moreover, the Wattage calculation for the 3.3V rail is missing (should be 3.3*24 given that the maximum amperage for the 3.3V rail is 24A, this must be verified). The value 120 (W or VA) must be for the 5V rail since 5V*24A=120 VA/W...

    Also note that I'm making a distinction between Watts (W) and Volt-Amperes (VA) although they have the same dimension. The reason is this:

    http://electronicdesign.com/energy/what-s-difference-between-watts-and-volt-amperes

    I hope you do the same.
  • Aris_Mp
    275838 said:
    The "Power Specifications" table on the second page is wrong. The third line must be "Maximum Watts" and not "Maximum Volts". Moreover, the Wattage calculation for the 3.3V rail is missing (should be 3.3*24 given that the maximum amperage for the 3.3V rail is 24A, this must be verified). The value 120 (W or VA) must be for the 5V rail since 5V*24A=120 VA/W... Also note that I'm making a distinction between Watts (W) and Volt-Amperes (VA) although they have the same dimension. The reason is this: http://electronicdesign.com/energy/what-s-difference-between-watts-and-volt-amperes I hope you do the same.


    The max power is the combined max power that both rails can deliver. Hence while each rail can go up to 24 A both of them can deliver only up to 120 W (combined). This means that either the 5V rail can go up to 120 W alone (so zero W for the 3.3V one) or the 3.3V rail can go up to 24 A and the 5V at 8.16 A.

    In DC we use Watts. VA is for AC. In DC Watts = VA

    As for the max voltage yeap this will be fixed.