EVGA 450 B3 PSU Review

Load Regulation, Hold-Up Time & 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 hold-up time we measured is satisfactory, since it is much longer than 17ms. Moreover, the power-good signal is accurate, dropping 3.4ms before the rails go out of spec. Super Flower does a good job in this regard.

Inrush Current

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

It seems there are problems elsewhere in this PSU, though. Apparently, the NTC thermistor doesn't effectively limit inrush currents during the PSU's start-up phase.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the 450 B3's efficiency. The applied load equals (approximately) 10 to 110 percent of the PSU's maximum load 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 0.1A. This test reveals whether a PSU is compatible with Intel's C6/C7 sleep states 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
Fan Noise
Temps (In/Out)PF/AC Volts
11.900A1.985A1.984A0.981A44.76380.203%0 RPM
<6.0 dB(A)
24.830A2.970A2.980A1.181A89.73285.002%1005 RPM20.9 dB(A)38.75°C0.968
38.107A3.478A3.496A1.380A134.89386.183%1005 RPM20.9 dB(A)38.91°C0.980
411.375A3.976A3.980A1.580A179.73286.829%1005 RPM20.9 dB(A)39.19°C0.986
514.314A4.976A4.981A1.785A224.76186.641%1276 RPM29.0 dB(A)39.70°C0.990
617.252A5.977A5.985A1.990A269.74686.424%1315 RPM30.4 dB(A)40.40°C0.991
720.199A6.986A6.993A2.195A314.76285.731%1462 RPM34.3 dB(A)41.48°C0.993
823.151A7.988A8.008A2.400A359.73985.056%1584 RPM35.9 dB(A)42.61°C0.993
926.534A8.491A8.536A2.405A404.80884.253%1667 RPM38.1 dB(A)43.85°C0.993
1029.666A9.009A9.039A3.025A449.68983.325%1817 RPM42.0 dB(A)45.47°C0.994
1133.397A9.014A9.051A3.030A494.67682.329%1945 RPM42.1 dB(A)46.33°C0.994
CL10.099A13.019A13.005A0.004A109.38079.493%1425 RPM32.3 dB(A)43.02°C0.977
CL237.474A1.004A1.002A1.002A468.25484.034%1817 RPM42.0 dB(A)44.77°C0.994

Load regulation is tight on every rail except for the 5VSB one, which goes out of the 3% range. And although the PSU is only rated at 40°C, it delivers its full load (plus more) for a prolonged period at 46°C. This shows that the platform is resilient to high operating temperatures.

The PSU operates in passive mode during the first test. In the next three, its fan spins fairly slowly, generating very little noise. During the sixth test, noise barely exceeds 30 dB(A). It's only under full load that our readings exceed 40 dB(A).

Given its low efficiency rating (and our corresponding measurements), this is a surprisingly quiet power supply.

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  • raotor
    Blowing up on the bench & the fuse not blowing seems to me to be rather more than an issue. I'd like Tom's to go buy another retail 450 Watt unit & see if it does the same. In addition, I see no mention of the other units in the range being tested which is odd as all models within the B3 line were purchased. Do we know if, say, the 550 Watt version suffers from the same safety issue.

    Further, EVGA's lack of response to this fault is not good for their PR. I'd even go so far as to suggest that such a dangerous failing should be grounds for banning this model from sale until EVGA can recall & fix the units.
  • termathor
    Hi there,

    Curious if EVGA came back to you, guys @ Toms Hardware on this on this fuse not working ...
    Seems to me the issue was serious enough to warrant an investigation !

    Did they really not come back with an explanation ????