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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 observed is longer than 20ms, and the 850 B3's power-good signal is accurate.
Inrush Current
For details on our inrush current testing, please click here.
The inrush current is normal for this unit's capacity.
Load Regulation And Efficiency Measurements
The first set of tests reveals the stability of the voltage rails and the 850 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 # | 12V | 5V | 3.3V | 5VSB | DC/AC (Watts) | Efficiency | Fan Speed (RPM) | Fan Noise (dB[A]) | Temps (In/Out) | PF/AC Volts |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 5.210A | 1.985A | 1.991A | 0.980A | 84.785 | 80.878% | 0 | <6.0 | 43.15°C | 0.954 |
| 12.128V | 5.047V | 3.310V | 5.092V | 104.831 | 38.55°C | 115.18V | ||||
| 2 | 11.444A | 2.971A | 2.992A | 1.181A | 169.620 | 85.014% | 0 | <6.0 | 45.29°C | 0.982 |
| 12.125V | 5.041V | 3.305V | 5.076V | 199.521 | 40.50°C | 115.18V | ||||
| 3 | 18.052A | 3.478A | 3.510A | 1.380A | 254.853 | 86.712% | 1218 | 27.3 | 41.24°C | 0.989 |
| 12.119V | 5.036V | 3.300V | 5.060V | 293.906 | 46.13°C | 115.19V | ||||
| 4 | 24.648A | 3.977A | 4.001A | 1.584A | 339.727 | 87.533% | 1276 | 29.0 | 41.29°C | 0.992 |
| 12.112V | 5.032V | 3.296V | 5.045V | 388.113 | 46.48°C | 115.20V | ||||
| 5 | 30.912A | 4.974A | 5.009A | 1.785A | 424.624 | 87.466% | 1338 | 30.7 | 41.63°C | 0.994 |
| 12.104V | 5.026V | 3.292V | 5.029V | 485.473 | 46.95°C | 115.22V | ||||
| 6 | 37.193A | 5.977A | 6.022A | 1.994A | 509.607 | 86.950% | 1462 | 34.3 | 42.72°C | 0.995 |
| 12.094V | 5.021V | 3.287V | 5.010V | 586.089 | 48.26°C | 115.19V | ||||
| 7 | 43.502A | 6.981A | 7.038A | 2.199A | 594.560 | 86.345% | 1600 | 36.1 | 43.47°C | 0.996 |
| 12.079V | 5.017V | 3.282V | 4.992V | 688.583 | 49.30°C | 115.20V | ||||
| 8 | 49.797A | 7.987A | 8.058A | 2.410A | 679.494 | 85.549% | 1743 | 40.0 | 44.14°C | 0.996 |
| 12.071V | 5.010V | 3.275V | 4.975V | 794.273 | 50.18°C | 115.18V | ||||
| 9 | 56.545A | 8.488A | 8.583A | 2.414A | 764.493 | 84.596% | 1885 | 42.2 | 44.62°C | 0.996 |
| 12.060V | 5.007V | 3.271V | 4.965V | 903.702 | 50.88°C | 115.18V | ||||
| 10 | 63.031A | 9.005A | 9.088A | 3.036A | 849.365 | 83.782% | 1885 | 42.2 | 45.71°C | 0.997 |
| 12.052V | 5.002V | 3.267V | 4.935V | 1013.785 | 52.33°C | 115.18V | ||||
| 11 | 70.143A | 9.016A | 9.099A | 3.042A | 934.308 | 82.482% | 2014 | 43.1 | 46.20°C | 0.997 |
| 12.041V | 4.997V | 3.262V | 4.925V | 1132.742 | 53.15°C | 115.18V | ||||
| CL1 | 0.098A | 14.023A | 14.004A | 0.004A | 117.803 | 77.549% | 1432 | 32.6 | 44.59°C | 0.974 |
| 12.123V | 5.027V | 3.292V | 5.107V | 151.908 | 50.67°C | 115.20V | ||||
| CL2 | 70.778A | 1.004A | 1.003A | 1.002A | 865.942 | 83.783% | 2003 | 43.0 | 47.16°C | 0.996 |
| 12.046V | 5.011V | 3.278V | 5.022V | 1033.550 | 53.82°C | 115.18V |
Load regulation is pretty tight on every rail, particularly considering this PSU's price point. Better still, the 850 B3 delivers more than its full power at 46°C.
The registered efficiency levels are low though, especially under full load. And the fan speed profile is quite aggressive once the operating temperature and load increase. Of course, this is a low-efficiency PSU, so high fan speeds are expected; they help keep the internal temperature manageable. As a result, EVGA's 850 B3 easily satisfies the 80 PLUS Bronze requirements, even under high operating temperatures.
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