EVGA SuperNOVA 1600 P2 Power Supply Review

Transient Response Tests

In these tests, we monitor the response of the PSU in two different scenarios. First, a transient load (10A at +12V, 5A at 5V, 5A at 3.3V and 0.5A at 5VSB) is applied to the PSU for 200ms while the PSU is working at 20-percent load. In the second scenario, the PSU is hit by the same transient load while operating at 50-percent load. In both tests, we use our oscilloscope to measure the voltage drops caused by the transient load. The voltages should remain within the ATX specification's regulation limits.

These tests are crucial since they simulate transient loads a PSU is likely to handle (such as booting a RAID array, an instant 100-percent load of CPU/GPUs, etc.). We call these tests "Advanced Transient Response Tests," and they are designed to be very tough to master, especially for a PSU with a capacity below 500W.

Advanced Transient Response 20%
Voltage
Before
After
Change
Pass/Fail
12V
12.216V
12.179V
0.30%
Pass
5V
5.045V
4.935V
2.18%
Pass
3.3V
3.312V
3.180V
3.99%
Pass
5VSB
5.031V
5.003V
0.56%
Pass
Advanced Transient Response 50%
Voltage
Before
After
Change
Pass/Fail
12V
12.183V
12.143V
0.33%
Pass
5V
5.029V
4.923V
2.11%
Pass
3.3V
3.299V
3.170V
3.91%
Pass
5VSB
5.007V
4.978V
0.58%
Pass

At +12V, this unit registers superb performance. In the high-capacity segment, only the 1600 G2 manages to match and even outdo this unit's showing in this rail and test. On the minor rails, the results are only average, though the situation improves at 5VSB. There, performance is  top-notch and the 1600 P2 scores first place in the corresponding chart, with the 1600 G2 close behind.

Below are the oscilloscope screenshots we took during Advanced Transient Response Testing.

Transient Response At 20-Percent Load

Transient Response At 50-Percent Load

Turn-On Transient Tests

We measure the response of the PSU in simpler transient load scenarios—during the power-on phase—in the next set of tests.

For the first measurement, we turn the PSU off, dial in the maximum current the 5VSB can output and then switch on the PSU. In the second test, we dial the maximum load +12V can handle and start the PSU while it's in standby mode. In the last test, while the PSU is completely switched off (we cut off power or switch the PSU off by flipping its on/off switch), we dial the maximum load the +12V rail can handle before switching the PSU on from the loader and restoring power. The ATX specification states that recorded spikes on all rails should not exceed 10 percent of their nominal values (+10 percent for 12V is 13.2V and 5.5V for 5V).

There is only a tiny voltage overshoot at 5VSB, which is nothing to worry about, and the results of the other two tests are close to perfection. It is amazing to see a 1.6kW monster instantly delivering its full power without the slightest problem.

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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.