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Seasonic G-Series 450W PSU Review

Seasonic's G series consists of reliable, high-performance PSUs. Today, we're reviewing the G-450 with 450W capacity, which features a semi-modular cabling design.

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.

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Hold-Up Time

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

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The hold-up time easily goes above the minimum dictated by the ATX spec.

Inrush Current

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

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The registered inrush current is pretty high; however, we should note that we repeated the test procedure several times and took the worst-case scenario into consideration in the charts above.

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 to 110 percent of the maximum load the supply can handle, 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. In the second test, we determined the maximum load the +12V rail could handle with minimal load on the minor rails.  

Test12V(A/V)5V(A/V)3.3V(A/V)5VSB(A/V)PowerDC/AC(W)Efficiency(%)Fan Speed(RPM)Fan NoisedB(A)TempIn/Out(°C)PF/AC (V)
11.897A1.974A1.965A0.995A44.7380.0364528.037.900.979
12.200V5.073V3.354V5.008V55.8941.43115.1V
24.833A2.959A2.959A1.200A89.7586.1282031.338.620.995
12.183V5.064V3.343V4.997V104.2242.17115.1V
38.117A3.463A3.475A1.400A134.8387.85105034.838.880.995
12.166V5.057V3.334V4.989V153.4842.69115.1V
411.405A3.961A3.967A1.605A179.7488.53135043.539.870.996
12.150V5.049V3.324V4.977V203.0343.97115.1V
514.362A4.968A4.976A1.811A224.7588.70169044.840.230.997
12.132V5.037V3.314V4.967V253.3844.62115.1V
617.326A5.965A5.994A2.015A269.6888.53195549.440.820.997
12.116V5.026V3.303V4.954V304.6145.56115.1V
720.298A6.978A7.017A2.223A314.7088.20196049.441.480.997
12.100V5.017V3.291V4.943V356.8046.45115.1V
823.276A7.989A8.050A2.430A359.6787.76196049.442.930.998
12.085V5.007V3.279V4.931V409.8448.31115.1V
926.692A8.501A8.593A2.435A404.7487.40198549.543.670.998
12.070V4.998V3.269V4.924V463.0949.41115.1V
1030.058A9.029A9.107A2.541A449.5686.86198549.544.460.998
12.055V4.988V3.260V4.913V517.5850.54115.1V
1133.835A9.039A9.129A2.545A494.5586.32198549.545.530.998
12.039V4.981V3.253V4.908V572.9551.92115.1V
CL10.098A12.009A12.005A0.004A100.9282.91195549.443.840.995
12.178V5.019V3.285V5.007V121.7248.14115.1V
CL236.962A1.003A1.003A1.001A458.9587.63198549.544.970.998
12.056V5.026V3.307V4.968V523.7551.16115.1V

The load regulation isn't the best for a PSU in this category, but all of the rails still managed to stay within three percent, even under the tough conditions we apply during our tests. Also, the G-450 didn't manage to meet the 80 PLUS Gold efficiency requirements. However, it's worth mentioning that the 80 PLUS certifications are conducted at low ambient temperatures of 23 C (73 F). In comparison, we conduct our tests at above 40 C (104 F), and during full load tests, the temperatures inside our hot box can exceed 45 C (113 F).

Up to the 30 percent load test, the output noise was pretty low. Beyond 30 percent, though, the noise went above 40 dB(A) and, in some tests, reached almost 50 dB(A). Clearly, this PSU can be very noisy. Seasonic should have used a larger or lower-speed fan.

Aris Mpitziopoulos
Aris Mpitziopoulos is a Contributing Editor at Tom's Hardware US, covering PSUs.