EVGA SuperNOVA 850 T2 Power Supply Review

Load Regulation, Hold-Up Time And Inrush Current

To learn more about our PSU tests and methodology, please check out How We Test Power Supply Units. 


Primary Rails And 5VSB Load Regulation

Load Regulation testing is detailed here.

Hold-Up Time

Our hold-up time tests are described in detail here.

The measured hold-up time is significantly longer than the ATX spec's minimum requirement, so everything's fine here. The same applies to the power-good signal. Disturbingly, we've seen a lot of high-end PSUs fail these crucial tests, including the SuperNOVA 850 P2. It's obviously a relief that at least the top Leadex platform isn't plagued by the same issues.

Inrush Current

For details on our inrush current testing, please click here.

The inrush current with 115V is low for a 850W PSU, while with 230V is normal.

Load Regulation And Efficiency Measurements

The first set of tests explores voltage rail stability and efficiency. The applied load equals (approximately) 10 to 110 percent of the supply's maximum in increments of 10 percentage points.

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

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed (RPM)Noise (dB[A])Temps (In/Out)PF/AC Volts
15.169A1.983A1.988A0.981A84.7889.79%0045.43 °C0.945
12.226V5.040V3.318V5.091V94.4237.55 °C115.1V
211.360A2.969A2.984A1.180A169.6492.76%0047.18 °C0.976
12.219V5.034V3.315V5.081V182.8838.55 °C115.1V
317.918A3.478A3.499A1.375A254.8793.70%0048.24 °C0.988
12.212V5.029V3.312V5.074V272.0039.40 °C115.1V
424.464A3.981A3.989A1.575A339.7693.83%0049.62 °C0.994
12.205V5.024V3.308V5.066V362.1040.26 °C115.1V
530.669A4.978A4.990A1.775A424.6193.59%0051.30 °C0.995
12.200V5.018V3.305V5.058V453.6841.19 °C115.1V
636.898A5.983A5.998A1.980A509.7193.20%0054.06 °C0.996
12.194V5.012V3.300V5.049V546.9042.10 °C115.1V
743.120A6.997A7.008A2.180A594.6192.68%62020.843.67 °C0.997
12.187V5.005V3.296V5.040V641.5958.36 °C115.1V
849.369A8.002A8.019A2.385A679.5692.09%94030.244.94 °C0.998
12.177V4.999V3.292V5.030V737.9055.46 °C115.1V
956.059A8.507A8.548A2.385A764.5891.48%94030.245.28 °C0.998
12.166V4.994V3.287V5.026V835.7956.12 °C115.1V
1062.699A9.028A9.054A2.488A849.4590.92%131541.747.19 °C0.998
12.157V4.989V3.279V5.020V934.2958.26 °C115.1V
1169.732A9.031A9.059A2.490A934.3890.54%131541.747.68 °C0.998
12.149V4.985V3.278V5.016V1032.0559.26 °C115.1V
CL10.099A12.009A12.005A0.003A101.1486.26%940 30.245.29 °C0.962
12.232V5.017V3.304V5.096V117.2553.53 °C115.1V
CL270.794A1.002A1.003A1.002A873.6791.43%1315 41.746.89 °C0.998
12.152V5.006V3.284V5.059V955.5755.05 °C115.1V

Load regulation on the +12V and 5VSB rails is tight. The 5V and 3.3V rails are a little above 1%, so they're pretty good. Efficiency is very high in all of the tests, and the PSU satisfies the stringent 80 PLUS Titanium requirements in the 20% and full load tests. It comes close in the 10% and 50% measurements. But given the high temperatures inside our hot-box during testing, we will definitely give the 850 T2 a pass; it rightfully deserves its Titanium badge. 

Our readings look good in the noise output benchmarks as well. At up to 60% load, the PSU operates passively. And at up to 90% the fan spins slowly, generating minimal noise. It's only during the full load and overload tests that the fan hits 100% duty cycle and we measure close to 42 dB(A). Under normal operating conditions, though, you won't see the fan spin. When it does start turning, you probably won't hear it.

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  • turkey3_scratch
    Very great unit, as expected. I would have liked to see the threshold for when OTP really kicks in, if it even does. Perhaps duct taping the exhaust grill will do the trick. It's nice to see Superflower use a MOV for a change. I just wish that 3.3V rail would not get so near 3.14V during the transient response tests, but realistically I don't expect the 3.3V rail to get that sudden load these days.

    Also @Aris, are you sure there's only 4 y caps? I thought those blue sleeves store multiple y caps? Or do they not?
  • damric
    That's some yummy low ripple for overclocking.
  • Aris_Mp
    if you mean the blue components before/after the bridge rectifier, they are X caps and I didn't count them in the EMI filter on purpose.
  • ZeusGamer
    I've had the G2 model of this power supply and it's still working great after two years. I'm really impressed by EVGA with these G2 and T2 models.
  • JackNaylorPE
    Efficiency is nice... I guess .... but with that 3.3 and 5V performance, I'm not impressed.
  • Dark Lord of Tech
    3.3 rail can vary per unit doesn't worry me a bit.
  • Dark Lord of Tech
    3.3 rail can vary per unit , doesn't worry me a bit. Every test model for a review can produce different results.
  • JackNaylorPE
    To each his own I guess... but for the ridiculous price of $240, I'd want better. The Corsair 860 and coolermaster V850 PSUs finish 1 and 2 and are much cheaper.

    The unit would fail to meet the ATX spec at 5%, and this comes in at a rather dismal 4.5 %... yes, this does vary from unit to unit (and this is a bad thing) If the unit that winds up in the hands of a review site gets two outta 3 rails at 4.5%, I shudder to think what we might get ordering off newegg. In the review graphs, it's the bottom of the chart against all the other PSUs with which its compared.

    The focus on efficiency in the ranking of PSUs in an enthusiast box is a criteria which escapes me ... I never walked into a Porsche dealership where the salesman's first pitch was "this model is great, it has the best gas mileage in our entire line'.
  • yyk71200
    Differences in effissiency between gold, platinum, and titanium psus are rather small and do not justify price differences. Quality of output is more important criteria in choosing a psu than small differences in wattage consumed.
  • JackNaylorPE
    ^^ ^^
  • turkey3_scratch
    It's $240? Yeah, I'd never see myself purchasing this at that price point. I do see myself purchasing the Seasonic Snow White perhaps some time in the future. I'm with JackNaylorPE, I don't really care about efficiency, but it does have impressive efficiency, still. But as for that 3.3V rail, in a normal system there is not going to be a sudden 5A increase on this rail! RAM only primarily uses 3.3V today, I know GPUs do some and probably some other minor things, but realistically this won't happen. From my personal opinion, though, I want a PSU that can handle anything and everything well, and for $240 it doesn't meet my expectations of that.

    I love the Tomshardware tests because Aris tests things other reviewers do not. I find that no unit manages to perfectly glide over everything. Oh, and I'm happy with the holdup time on this unit, too. But the price of this is far too high. Make it $150-$160 and then we're talking.
  • JackNaylorPE
    And the 1050 snow just barely breaks $200 ... 750 is $160

    The 750 / 1080 snow topped out at 2.8

    Tho it must also be said that below a certain point, you don't get any additional gains to the extent that there will be no measurable impact. I'm happy if I can reduce temps say from 75 to 73 ... but don't really feel I have gained anything by going from 72 to 71.9 At some point, ya gotta ask is there a reason to care ? But when the Corsair CX600m scores 4.64% and the best this $240 PSU can do is 4.5%, I don't feel it's "got the complete package".
  • Dark Lord of Tech
    Decent price! :D

    Ordered 2 , lets see how they perform for my future builds.
  • techgeek
    In the one close up picture of the daughterboards, it looks like U3 met with a catastrophic failure. It looks like it popped and half of it is missing? Can you confirm?
  • babernet_1
    In the one close up picture of the daughterboards, it looks like U3 met with a catastrophic failure. It looks like it popped and half of it is missing? Can you confirm?

    The U3 is actually not installed.
  • techgeek
    I'm not sure you are looking at the same picture I am. There is clearly half a component there, I presume a FET, but there doesn't look like there is enough to make out.
  • Virtual_Singularity
    Awesome power supply unit, if a bit pricey. Go Superflower!! And btw, excellent review Aris. I've noticed the psu reviews on this site have become more thorough and comprehensive lately. Much appreciated and good job.
  • Aris_Mp
    There is no U3 FET installed on the +12V boards.
  • techgeek
    1903369 said:
    There is no U3 FET installed on the +12V boards.

    I had another look, I think its just dirty there, and an imprint in the solder mask / conformal coating there that makes it look like half a component. I can see the solder lands on both sides now. Just looked odd. The 'dirly' spot looked to me like where a FET had blown up and half had chipped away. I've seen this type of failure a few times, so I thought that maybe this was one of these occasions.