Seasonic Focus Plus Gold 850 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 measure is pretty long, and the power-good signal is accurate. This is what we expect from a Seasonic PSU.

Inrush Current

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

With 115V, the inrush current is low. However, the situation turns with 230V input.

Load Regulation And Efficiency Measurements

The first set of tests reveals the stability of the voltage rails and the SSR-850FX'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
PSU Noise
Temps (In/Out)PF/AC Volts
15.222A1.996A1.987A0.985A84.99286.748%621 RPM
11.6 dB(A)
211.485A2.997A2.979A1.184A170.30190.194%565 RPM10.7 dB(A)38.83°C0.988
318.076A3.497A3.490A1.384A255.48391.014%550 RPM10.4 dB(A)39.01°C0.990
424.667A3.997A3.973A1.585A340.57591.022%550 RPM10.4 dB(A)39.57°C0.991
530.861A4.998A4.968A1.786A425.08290.655%560 RPM10.5 dB(A)40.75°C0.990
637.117A5.997A5.965A1.988A510.38490.095%880 RPM20.6 dB(A)41.79°C0.991
743.348A6.997A6.961A2.192A595.27889.427%1333 RPM31.4 dB(A)42.33°C0.991
849.587A7.998A7.962A2.395A680.21288.693%1984 RPM41.5 dB(A)42.93°C0.992
956.248A8.499A8.474A2.398A765.24187.942%2310 RPM45.1 dB(A)44.02°C0.992
1062.643A9.000A8.958A3.009A849.95687.009%2320 RPM45.2 dB(A)45.40°C0.993
1169.683A9.000A8.962A3.012A935.52585.851%2320 RPM45.2 dB(A)47.19°C0.993
CL10.159A12.001A12.000A0.001A101.98585.242%560 RPM10.5 dB(A)43.42°C0.983
CL270.008A1.002A1.001A1.001A863.06387.262%2320 RPM45.2 dB(A)45.75°C0.993

On every rail except the 5VSB one (which is still within 3%), the load regulation we observe is extremely tight. Seasonic's new platform achieves excellent performance in this discipline, despite its budget orientation. The measured efficiency levels are pretty good as well, while the fan profile is relaxed. It's only when you push the PSU hard, under 80% of its maximum-rated-capacity load and high operating temperatures, that the fan spins at full speed.

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