EVGA SuperNOVA 1600 P2 Power Supply Review

Load Regulation, Hold-Up Time And Inrush Current

Test Setup

Isolation Transformer
3 KVA
AC Source
Chroma 61604 (2 KVA)
Power Meter
Yokogawa WT210 Power Analyzer
Electronic Loads
2x Chroma 6314A Mainframes
6x 63123A (350W each)
1x 63122A (2x 100W)
1x 63101A (200W)
Oscilloscopes
Rigol DS2072A, 2x Picoscope 3424, Rigol VS5042, Stingray DS1M12
Multimeters
Fluke 298 & 175, Keithley 2015 THD
Thermocouple Data Logger
Picotech TC-08 (eight channels)
Sound Analyzer
Brüel & Kjær 2250-L G4
Type 4189 microscope
(16.6-140 dB[A]-weighted dynamic range)
Infrared Camera
FLIR E4 (modified to E8, 320x240 resolution)
Anechoic Chamber
Custom-made soundproofed with be Quiet! Noise Absorber Kit
Thermal Chamber
Custom-made equipped with automatically-controlled (through software) heating elements
Software
Custom-made application that includes monitoring, control and logging functions

All measurements are performed using two Chroma 6314A mainframes equipped with the following electronic loads: six 63123A (350W each), one 63102A (100W x2) and one 63101A (200W). The aforementioned equipment is able to deliver 2500W of load, and all loads are controlled by custom-made software (Faganas ATE). We also use a Rigol DS2072A oscilloscope, a Picoscope 3424 oscilloscope, a Picotech TC-08 thermocouple data logger, two Fluke multimeters (289 and 175), a Keithley 2015 THD 6.5-digit bench DMM and a Yokogawa WT210 power meter. In addition, we include a wooden box, which, along with some heating elements, we used as a hot box. Moreover, we have at our disposal three more oscilloscopes (Rigol VS5042, Stingray DS1M12 and a second Picoscope 3424) and a Class 1 Brüel & Kjær 2250-L G4  Sound Analyzer, which is equipped with a type 4189 microphone that features a 16.6-140 dB(A)-weighted dynamic range. Finally, the latest addition in our testing gear is a FLIR E4 infrared camera, which, through some firmware modifications (many thanks to the fine folks at EEVblog's forums for this) is now able to deliver 320x240 resolution.

We conduct all of our tests at 40 °C to 45 °C ambient temperature to more accurately simulate the environment seen inside a typical system, with the range being derived from a standard ambient assumption of 23 °C, and 17 to 22 °C added for the typical temperature rise within a system.

Primary Rails Load Regulation And 5VSB Regulation

The following charts show the voltage values of the main rails, recorded over a range from 60W to the maximum specified load, and the deviation (in percent) for the same load range. The last two charts show how the 5VSB rail deals with the load we throw at it.

Hold-Up Time

Hold-up time is an important PSU characteristic; it represents the amount of time, usually measured in milliseconds, that a PSU can maintain output regulations as defined by the ATX spec without input power. In other words, it is the amount of time the system can continue to run without shutting down or rebooting during a power interruption. The ATX specification sets the minimum hold-up time to 16ms with the maximum continuous output load.

In the following screenshot, the blue line is the mains signal and the yellow line is the "Power Good" signal. The latter is de-asserted to a low state when any of the +12V, 5V or 3.3V output voltages fall below the under-voltage threshold, or after the mains power has been removed for a sufficiently long time to guarantee that the PSU cannot operate anymore.

Strangely enough, the hold-up time of the 1600 P2 is significantly lower than the almost identical 1600 G2. Maybe in an effort to increase efficiency, EVGA had to make some changes that dropped the hold-up time below the ATX specification's 16ms.

Inrush Current

Inrush current or switch-on surge refers to the maximum, instantaneous input current drawn by an electrical device when it is first turned on. Because of the APFC capacitor's charging current, PSUs produce large inrush current right as they are turned on. This can trip circuit breakers and fuses, and may also damage switches, relays and bridge rectifiers. As a result, the lower the inrush current of a PSU right as it is turned on, the better.

Naturally, the inrush current with 115V input is significantly lower than 230V.

The inrush current of the 1600 P2 with 230V is among the highest we have ever measured. That doesn't place it very far from the rest of the pack, though.

Load Regulation and Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the PSU's efficiency. The applied load equals (approximately) 10 percent to 105 percent of the maximum load the supply can handle, in increments of 10 percentage points.

We conducted two additional tests. In the first metric, we stressed the two minor rails (5V and 3.3V) with a high load while the load at +12V was only 0.10 A. This test reveals whether the PSU is Haswell-ready or not. In the second test, we determined the maximum load the +12V rail could handle while the load on the minor rails was minimal. 

Load Regulation & Efficiency Tests
EVGA SuperNOVA 1600 P2
Test#
12V
5V
3.3V
5VSB
DC/AC
 (Watts)
Efficiency
Fan Speed
 (RPM)
Noise
 dB(A)
Temps
 (in/Out)
PF/AC
 Volts
1
11.305A
1.974A
1.988A
0.990A
159.77
88.47%
0
0
52.16 °C
0.975
12.226V
5.053V
3.318V
5.037V
180.60
39.83 °C114.9V
2
23.654A
2.967A
2.986A
1.191A
319.74
91.66%
0
0
53.44 °C0.992
12.213V
5.047V
3.313V
5.030V
348.85
41.00 °C114.8V
3
36.366A
3.475A
3.504A
1.390A
479.75
92.43%
0
0
56.39 °C0.995
12.200V
5.040V
3.308V
5.021V
519.03
43.82 °C114.8V
4
49.083A
3.971A
3.994A
1.595A
639.60
92.57%
1000
47.8
40.93 °C0.997
12.192V
5.034V
3.304V
5.012V
690.93
53.40 °C114.6V
5
61.467A
4.967A
5.001A
1.796A
799.45
92.35%
1000
47.8
42.31 °C0.998
12.185V
5.030V
3.299V
5.004V
865.65
56.88 °C114.4V
6
73.892A
5.971A
6.010A
2.001A
959.35
91.93%
1000
47.8
42.62 °C0.998
12.174V
5.024V
3.294V
4.995V
1043.60
59.40 °C114.3V
7
86.354A
6.976A
7.020A
2.203A
1119.23
91.45%
1000
47.8
43.91 °C0.999
12.161V
5.018V
3.288V
4.989V
1223.90
63.86 °C114.1V
8
98.843A
7.979A
8.042A
2.407A
1279.21
90.67%
1000
47.8
44.68 °C0.999
12.149V
5.012V
3.282V
4.979V
1409.45
67.25 °C113.9V
9
111.788A
8.481A
8.570A
2.411A
1439.33
89.86%
1530
51.3
46.34 °C0.998
12.137V
5.007V
3.279V
4.675V
1601.80
71.35 °C113.8V
10
124.480A
8.999A
9.071A
3.021
1599.27
89.16%
1540
51.4
46.90 °C0.998
12.127V
5.002V
3.274V
4.960V
1793.65
71.35 °C116.6V
11
131.141A
9.006A
9.076A
3.022A
1679.25
88.85%
1540
51.4
47.38 °C0.998
12.121V
4.999V
3.271V
4.958V
1890.10
75.02 °C116.7
CL1
0.099A
14.017A
14.005A
0.005A
117.97
81.71%
1000
47.8
43.35 °C0.968
12.234V
5.033V
3.298V
5.051V
144.37
60.66 °C115.0V
CL2
13.282A
1.002A
1.004A
1.002A
1628.99
89.32%
1540
51.4
46.00 °C0.998
12.122V
5.014V
3.288V
5.005V
1823.85
72.92 °C115.6V

The SuperNOVA 1600 G2 registers tighter voltage regulation on all rails. Apparently, in its effort to increase efficiency, Super Flower decided to decrease the load regulation performance a little bit. However, the 1600 P2 still exhibits excellent performance in this area. As you can see from the efficiency readings on the table above, Super Flower's approach allows for high efficiency throughout all load ranges, and the 1600 P2 successfully passes the strict 80 PLUS Platinum requirement.

In addition, despite the high ambient temperature inside our hot box, the power supply finishes the three initial tests without engaging its fan, thus keeping the output noise level at zero. Although we pushed the PSU hard, we still had to exceed 46 °C ambient in order to make the fan spin up. Up to a point, we were afraid that the fan circuit was broken since we expected much higher RPMs at such aggressive loads and operating temperatures. Super Flower must be incredibly confident about this platform's heat tolerance, since the fan increased its speed to >1500 RPM only when the PSU reached 1440W load and above. In addition, the large temperature delta difference between the PSU's intake and exhaust made quite an impression on us. We rarely see an exhaust temperature reaching 75 °C.

This thread is closed for comments
25 comments
    Your comment
  • 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.