EVGA 450 B3 PSU Review

Efficiency, Temperature & Noise

Efficiency

Our efficiency testing procedure is detailed here.

Using results from the previous page, we plotted a chart showing the 450 B3's efficiency at low loads, and loads from 10 to 110 percent of its maximum-rated capacity.

EVGA's 450 B3 takes the lead in efficiency from its main competitor, Corsair's CX450M. The differences aren't large under normal loads, but light loads make the gap more notable.

Efficiency At Low Loads

In the following tests, we measure the 450 B3's efficiency at loads significantly lower than 10 percent of its maximum capacity (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.

Test #12V5V3.3V5VSBDC/AC (Watts)EfficiencyFan Speed
Fan Noise
PF/AC Volts
11.194A0.493A0.477A0.191A19.62669.527%0 RPM
<6.0 dB(A)
0.770
12.204V5.045V3.324V5.135V28.228115.18V
22.415A0.992A0.990A0.391A39.75580.129%0 RPM<6.0 dB(A)0.895
12.199V5.042V3.323V5.123V49.614115.18V
33.643A1.477A1.503A5.111A59.84382.694%0 RPM<6.0 dB(A)0.941
12.193V5.039V3.321V5.111V72.367115.18V
44.858A1.986A1.983A0.781A79.78685.571%0 RPM<6.0 dB(A)0.967
12.190V5.036V3.320V5.099V93.239115.18V

With 20W load, efficiency drops below 70%. However, it passes the 80% mark under higher loads. These are good results for a budget-oriented PSU.

5VSB Efficiency

The ATX specification, along with CEC, ErP Lot 3 2014 and ErP Lot 6 2010/2013, states that 5VSB standby supply efficiency should be as high as possible, recommending 75 percent or higher with 550mA, 1A, and 1.5A of load. The PSU should also achieve higher than 75% efficiency at 5VSB under full load, or with 3A if its max current output on this rail is higher than 3A.

We take six measurements: one each at 100, 250, 550, 1000, and 1500mA, and one with the full load the 5VSB rail can handle.   

Test #5VSBDC/AC (Watts)EfficiencyPF/AC Volts
10.101A0.52166.709%0.056
5.143V0.781115.11V
20.251A1.29273.493%0.120
5.137V1.758115.11V
30.542A2.77776.145%0.214
5.126V3.647115.13V
41.002A5.11877.463%0.300
5.109V6.607115.14V
51.502A7.64377.720%0.350
5.090V9.834115.15V
63.001A15.08576.218%0.417
5.026V19.792115.15V

This PSU manages to meet the CEC, ErP Lot 3 2014 and ErP Lot 6 2013 requirements with 115V input. Efficiency is notably lower on this rail with 230V input though, and the CEC requirements are not met.

We have evaluated a great many Super Flower platforms, and it's painfully clear that the manufacturer uses an outdated 5VSB circuit in all of its designs. SF should upgrade this rail as soon as possible in order to satisfy all current requirements and directives with both voltage inputs (115V and 230V).

Power Consumption In Idle And Standby

In the table below, you'll find the power consumption and voltage values of all rails (except -12V) when the PSU is idle (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).

Mode12V5V3.3V5VSBWattsPF/AC Volts
Idle12.216V5.047V3.327V5.145V6.3630.318
115.2V
Standby0.1310.010
115.1V

The vampire power that our equipment measured is much higher compared to other, similar-capacity PSUs.

Fan RPM, Delta Temperature, And Output Noise

Our mixed noise testing is described in detail here.

The chart below illustrates the cooling fan's speed (in RPM), and the delta between input and output temperature. The results were obtained at 37°C (98.6°F) to 46°C (114.8°F) ambient temperature.   

The next chart shows the cooling fan's speed (again, in RPM) and output noise. We measured acoustics from one meter away, inside a hemi-anechoic chamber. Background noise inside the chamber was below 6 dB(A) during testing (it's actually much lower, but our sound meter’s microphone hits its floor), and the results were obtained with the PSU operating at 37°C (98.6°F) to 46°C (114.8°F) ambient temperature. 

The following graph illustrates the fan's output noise over the PSU's operating range. The same conditions of the above graph apply to our measurements, though the ambient temperature was between at 30°C (86°F) to 32°C (89.6°F).  

The semi-passive mode lasts a long time for such an inefficient PSU. No doubt, it helps that we're only dealing with 450W of capacity. Once the load goes over 240W at +12V, fan noise exceeds 30 dB(A). There is also a small region where our measurements indicate between 35-40 dB(A).

MORE: Best Power Supplies

MORE: How We Test Power Supplies

MORE: All Power Supply Content

This thread is closed for comments
36 comments
    Your comment
  • InvalidError
    Throwing higher current components at a problem isn't always the correct solution, especially when a 450W PSU is delivering somewhere north of 550W. The B3's components are clearly vastly sufficient to handle its rated load or even the 580W overload, which means the most likely reasons why a FET blew up are either a design flaw or manufacturing defect and the flaw/defect isn't necessarily in the FET or its immediately related circuitry.

    In this case, it seems like EVGA/Superflower may have incorrectly set the OCP on the 12V rail. I hope they meant to set it to something more conservative like 40A instead of the 50+ it may have been at here.

    As for the main fuse not blowing, that is normal: the fuse lives upstream from the APFC choke and most other filtering components while both the APFC and main switching transistors are connected to the APFC-boosted input hold-up capacitor. The transistor's lead blows up from the capacitor dumping its several joules of energy into the lead, the APFC chokes smooth out the current spike and the current seen by the fuse comes nowhere close to reaching its i2t rating. It is the capacitor's charge that blows up the transistor, not AC input current.
  • Aris_Mp
    I strongly disagree. The main fuse has to blow when there is a short on the primary side, which clearly is the case here, else the PSU is a fire hazard if the automatic relay on the home's main electrical panel doesn't work as it should. The spark every time we connect the PSU to the mains means that high current passes through the circuit, however the fuse still remains intact. Another clue here is that our lab's relay on the electrical panel automatically dropped (saving the day), meaning that more than 15 Amps of current were drawn from this particular AC socket!! So clearly the PSU's fuse should have blown. Finally, I have seen a great number of blown PSUs so far and all have some common component failures: primary or APFC FETs, bridge rectifier(s), main fuse. In any case the main fuse has to go else the design has a serious flaw.

    Some FETs might have increased Amps on papers, however in real life things can be different especially when the high RDS (on) values increase the operating temperatures. The part though in this PSU which I am not so sure about is the bridge rectifier, since it can only handle 8 Amps at 100C and usually I see more than 100C at the bridge. So if the bridge goes up to 115-120C its max current drops close to 5A according to its spec sheet so we only have 575W handling, which is much below the 700-720W that the PSU draws from the wall with 580W load.

    The APFC choke isn't for filtering purposes, but mainly for boosting voltage, this is why it is also called boost inductor. More about how the APFC converter works and an explanation on both most popular types (DCM, CCM) can be found here: http://www.tomshardware.com/reviews/power-supplies-101,4193-10.html. I think it is pointless to explain APFC's operation here since there is an entire section about it. The bulk cap's charge didn't exactly blow the FET, the FET just couldn't handle the increased Amperage that the cap provided because of the high load. Also the bulk cap drew this load from the mains network and didn't make it out of thin air!

    Finally please don't lose sight of the forest for the trees and confuse the readers on a subject that is clear. The fuse that protects the socket into which the PSU was connected dropped, meaning that more than 15 Amps passed through it! Given that this PSU's bridge can only handle up to 8 Amps normally its fuse should be less than 8A, however it survived not once, but both times that we tried it! This clearly shows a major flaw and on the same times proves that there is a short on the PSU's primary side, which draws LOTS of current! In any case the main fuse should open the circuit in order to protect the user and the equipment from damage or even fire. The main fuse not blowing is anything else but normal! I just have to point this out
  • kalmquist
    $50 for a modular power supply seems like a great deal, even with merely Bronze efficiency. This is a good reminder not to gamble on a PSU that hasn't been reviewed by a site like Tom's Hardware.
  • InvalidError
    1903369 said:
    The APFC choke isn't for filtering purposes

    Put a 1mH APFC choke in series with a short circuit and 350V, it'll limit current rise time seen from the input side to 35A/ms, so it does filter regardless of what its other purposes in the circuit is just like any inductor would.

    I missed the paragraph about the breaker tripping. If you have RCDs or AFCI breakers, they could be tripping due to faults other than a short-circuit. If you have class-A relays, it could also be tripping faster than the fuse is able to blow.

    Edit: missing a 0... 350V/1mH = 350A/ms.
  • AndrewJacksonZA
    Is this the PSU in the video at JG of the PSU that blew up in your lab, Aris? :-)
  • 10tacle
    Quote:
    But we are seriously troubled by its issue and EVGA's lack of a response when we probed for possible causes.


    That is deeply troubling, especially coming from a highly reputable hardware vendor like EVGA and who I have nothing but the highest respect for (I've been buying their GPUs solely since the GTX 275).

    I sincerely hope EVGA isn't quick to get back because they are trying to find a root cause with Superflower and rule in or out a bad manufacturing batch that got past Superflower, or a bad design. I hope for EVGA it's the former.
  • Aris_Mp
    @INVALIDERROR I will try this in a circuit simulation program I have, once I find some free time.

    @ANDREWJACKSONZA If you mean about the blowing PSU in smokes, nope this is another PSU.

    @10TACLE Once we have a response from EVGA we will post it of course. To be frank I waited for a second sample from the time I notified about this problem, however I was not offered one. Also from the start EVGA didn't send any B3 samples and this is why I had to buy them on my own (given the popularity of this line), in order to check them out. With the first chance I will also buy affordable PSUs from other vendors, which usually aren't offered as review samples, in order to evaluate them.

    I would buy another 450 B3 but it is out of stock every where I searched in Europe. If I manage to find one I will try the same test again of course. Nonetheless I faced problems with other B3 models as well, which I will mention in the next B3 review.
  • AndrewJacksonZA
    OK, thank you. Keep up the good work!
  • 80-watt Hamster
    I don't find it all that surprising that they didn't shoot for a higher efficiency rating. EVGA's primary market is the US (correct me if I'm wrong), and Silver is basically a non-entity here. Bronze is the volume segment, so having a strong contender there is a necessity, and pushing it to Gold would add to an already-crowded segment of their product stack.
  • Onus
    As nasty as that blow-up might be, if used in a machine that doesn't need more than 450W, is it really a problem? Arguably, someone who tries to run a 600W PC using a 450W PSU deserves what he gets. For low-end systems, this looks like a perfectly viable choice.
  • InvalidError
    1903369 said:
    @INVALIDERROR I will try this in a circuit simulation program I have, once I find some free time.

    If what you wanted to simulate is the current rise rate or filtering, no need to: Vinductor = L * di/dt. If the voltage is relatively constant for the period of interest, di/dt = V/L and I just realized that there is a missing 0 in my previous post, should have been 350A/ms for 350V and 1mH.

    Personally, I've seen breakers trip faster than fuses can blow quite a few times. On one particularly careless day, I managed to short a PSU to chassis tripping the breaker three times before its 6A input fuse died. Slow-blow fuses don't necessarily die on the first short when there is a faster device upstream.
  • 10tacle
    47340 said:
    Arguably, someone who tries to run a 600W PC using a 450W PSU deserves what he gets. For low-end systems, this looks like a perfectly viable choice.


    Or OEM replacements for that matter. I always recommend to people upgrading their OEM PC's crappy PSU. Recent case in point: a friend was in a bind with a dead PC used for his business and had no time to diagnose and/or build another. He rushed out to Best Buy and found an HP OMEN "gaming" PC on sale with a GTX 1070 Founder's Edition (the same thing Nvidia sells direct from their website).

    I went over there after he got back and the first thing I did was open the case and look at the PSU: as expected it was a non-branded 500W PSU with terrible max sustained wattage output specs with a low temp threshold. Yeah that's not happening. After he closed up we went to Fry's and picked up an EVGA 550W G2. The 550W G3 was $20 more which is the only reason we got the G2. Thank God we did apparently.
  • turkey3_scratch
    47340 said:
    As nasty as that blow-up might be, if used in a machine that doesn't need more than 450W, is it really a problem? Arguably, someone who tries to run a 600W PC using a 450W PSU deserves what he gets. For low-end systems, this looks like a perfectly viable choice.


    That's not really the situation where overpower protection is needed most of the time, though. If there is a shortage with a yellow wire with a low enough impedance, short-circuit protection will fail to detect it, and then as current rises it's up to OPP to save the day.

    Or if companies were smart they'd still be doing multiple 12V rails.
  • InvalidError
    1712875 said:
    Or if companies were smart they'd still be doing multiple 12V rails.

    For outputs under 40A, you should be fine with a single rail and working OCP/OPP set to the correct value: even #24 wires can pass safely 40A long enough to trip a working OCP. Not that having multiple output rails would have made any difference in the case of a primary-side catastrophic failure anyway.

    Also, having multiple rails does you very little good if their current limits are well beyond what they should have been as it appears to be the case here. A functional 40A OCP limit on the 12V rail here would have prevented the PSU from delivering more than 480W instead of allowing it to self-destruct at 580W.
  • the nerd 389
    It seems strange to me that the fact that the PSU exploded didn't seem to play into the performance score.

    IMHO, if a PSU represents a potential fire hazard, it seems fitting that it should not receive a better score than a PSU that doesn't. There should be a couple of other "deal-breaker" grade problems that, as I see it, should play into the overall performance rating so the product is not incorrectly portrayed on the comparison charts that you use in the Best PSU.

    Examples include:
  • Yuri_BR
    I would love to see a review abtout the EVGA 750 G3 - is it less noisy and has a better hold up time then the 850 G3? Do you have plans on doing a review on the 750 G3?
  • Onus
    If this failure had happened at 450W, or even 500W, I'd probably consider it a dealbreaker as well. At 580W though, although it is definitely worth noting, that's so far beyond what a 450W PSU should be able to handle that I'm much less concerned; short-circuit protection is shown as working. I really hope EVGA is sincerely looking into the matter though, not simply ignoring it.
  • InvalidError
    983009 said:
    IMHO, if a PSU represents a potential fire hazard, it seems fitting that it should not receive a better score than a PSU that doesn't.

    EVERY PSU or device handling high power is a potential fire hazard and not immune to the occasional material or manufacturing defect that could cause an otherwise good design to fail catastrophically.

    With a sample size of one, it is impossible to tell whether this is an isolated defect, a rampant QA problem from a parts supplier or an outright design flaw. The only thing that can be said is that one sample failed. While this may not inspire confidence, it isn't sufficient to definitively condemn the product.
  • turkey3_scratch
    2484332 said:
    I would love to see a review abtout the EVGA 750 G3 - is it less noisy and has a better hold up time then the 850 G3? Do you have plans on doing a review on the 750 G3?


    They should be the same platform, so I expect them to be very similar. Internals comparison:

    http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=500
    http://www.tomshardware.com/reviews/evga-supernova-850-g3-psu,4930-3.html

    Also, you can see noise ratings at http://cybenetics.com though it seems they don't have the 750 G3 so nevermind.
  • Yuri_BR
    1712875 said:
    2484332 said:
    I would love to see a review abtout the EVGA 750 G3 - is it less noisy and has a better hold up time then the 850 G3? Do you have plans on doing a review on the 750 G3?
    They should be the same platform, so I expect them to be very similar. Internals comparison: http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story5&reid=500 http://www.tomshardware.com/reviews/evga-supernova-850-g3-psu,4930-3.html Also, you can see noise ratings at http://cybenetics.com though it seems they don't have the 750 G3 so nevermind.


    About noise, checking EVGA site I saw that the fan curve in the 750G3 is much more relaxed then the 850G3 (and 1000G3), so I was wondering how that would translate in the noise output.

    But considering the 750 G3 has the same internals and less power then the 850 G3, can that improve the hold up time? I read the 850P2 and 750P2 review here on tomshardware, and the 750 P2 has a much better hold up time. Could that also happen with the G3 series?
  • turkey3_scratch
    Yeah it could have better holdup time, though that's not very important to most people.
  • InvalidError
    2484332 said:
    But considering the 750 G3 has the same internals and less power then the 850 G3, can that improve the hold up time?

    The input capacitor dictates how much energy it holds and how long it takes the PSU to cut off under load. If you measure hold-up under full load as is usually the case, you can expect the 750W PSU to last ~12% longer than an otherwise identical 850W PSU simply because it is outputting 12% less power and draining its input capacitor 12% slower. If you compare both PSUs while under a 400W load however, you can expect nearly identical results.
  • Yuri_BR
    Actually I was thinking about getting the 850P2, but I gave up because of the hold up time test ... I also liked the 850 G3 review, very clean power, but then the noisy fan pushed me away from it. My last hope was the 750G3 being a middle ground betwing both.

    What I really want is a 750-850w PSU that delivers clean power, no coil wine, and zero to very low noise at up to 500w usage at normal room temperature.

    I can buy the 750G3 or the 750P2, their prices are very close (or even the 850P2 paying a bit more). What would you pick? It seens that the G3 has clener power with tighter regulations, is that right? Any advantages of having the P2 thicker 16 AWG cables?
  • turkey3_scratch
    2484332 said:
    Actually I was thinking about getting the 850P2, but I gave up because of the hold up time test ... I also liked the 850 G3 review, very clean power, but then the noisy fan pushed me away from it. My last hope was the 750G3 being a middle ground betwing both. What I really want is a 750-850w PSU that delivers clean power, no coil wine, and zero to very low noise at up to 500w usage at normal room temperature. I can buy the 750G3 or the 750P2, their prices are very close (or even the 850P2 paying a bit more). What would you pick? It seens that the G3 has clener power with tighter regulations, is that right? Any advantages of having the P2 thicker 16 AWG cables?


    You should buy one of the Aerocool P7 power supplies. Here is a review of the 650W https://www.techpowerup.com/reviews/Aerocool/ACP-650FP7/ - it doesn't get much quieter than that. It's an incredible PSU.