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Corsair RMx Series 850 W (2021) Review
Fan Noise »Efficiency
Using the results we gathered so far, we plotted a chart showing the PSU's efficiency at low loads and loads ranging from 10 to 110 percent of the maximum-rated capacity.
Efficiency is satisfactory in the 10%–100% load range and very high in all other regions.
10%–110% Load Testing
These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures and show how the fan-speed profile behaves under harsh operating conditions.| Load Regulation & Efficiency Testing Data - Corsair RM850x | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Test | 12 V | 5 V | 3.3 V | 5VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | Temp (In/Out) | PF/AC Volts |
| 10% Load | 5.257A | 1.988A | 2.010A | 0.997A | 84.958W | 88.219% | 0 RPM | <6.0 dB(A) | 46.35°C | 0.868 |
| 12.051V | 5.031V | 3.284V | 5.018V | 96.303W | 40.33°C | 230.35V | ||||
| 20% Load | 11.554A | 2.985A | 3.019A | 1.197A | 170.031W | 91.887% | 0 RPM | <6.0 dB(A) | 47.57°C | 0.949 |
| 12.041V | 5.027V | 3.281V | 5.012V | 185.044W | 40.86°C | 230.34V | ||||
| 30% Load | 18.228A | 3.484A | 3.519A | 1.398A | 255.037W | 92.895% | 0 RPM | <6.0 dB(A) | 48.31°C | 0.971 |
| 12.014V | 5.024V | 3.280V | 5.007V | 274.544W | 41.15°C | 230.34V | ||||
| 40% Load | 24.897A | 3.984A | 4.026A | 1.600A | 340.046W | 92.794% | 0 RPM | <6.0 dB(A) | 49.51°C | 0.980 |
| 12.003V | 5.021V | 3.279V | 5.001V | 366.454W | 41.66°C | 230.34V | ||||
| 50% Load | 31.227A | 4.984A | 5.035A | 1.801A | 424.963W | 92.458% | 413 RPM | 8.4 dB(A) | 42.58°C | 0.984 |
| 11.991V | 5.019V | 3.278V | 4.997V | 459.626W | 51.22°C | 230.34V | ||||
| 60% Load | 37.547A | 5.983A | 6.047A | 2.000A | 509.502W | 92.028% | 597 RPM | 15.3 dB(A) | 42.92°C | 0.987 |
| 11.977V | 5.016V | 3.275V | 4.993V | 553.636W | 52.40°C | 230.34V | ||||
| 70% Load | 43.935A | 6.984A | 7.058A | 2.205A | 594.838W | 91.485% | 842 RPM | 26.2 dB(A) | 43.23°C | 0.989 |
| 11.966V | 5.013V | 3.273V | 4.989V | 650.204W | 53.57°C | 230.34V | ||||
| 80% Load | 50.328A | 7.988A | 8.067A | 2.408A | 680.181W | 90.892% | 1070 RPM | 33.3 dB(A) | 43.42°C | 0.990 |
| 11.957V | 5.009V | 3.272V | 4.984V | 748.336W | 54.28°C | 230.33V | ||||
| 90% Load | 57.131A | 8.492A | 8.562A | 2.409A | 765.103W | 90.307% | 1334 RPM | 39.4 dB(A) | 44.88°C | 0.991 |
| 11.948V | 5.005V | 3.270V | 4.982V | 847.224W | 56.11°C | 230.32V | ||||
| 100% Load | 63.679A | 8.996A | 9.087A | 3.020A | 849.907W | 89.499% | 1914 RPM | 48.1 dB(A) | 45.96°C | 0.991 |
| 11.938V | 5.003V | 3.268V | 4.968V | 949.626W | 58.12°C | 230.33V | ||||
| 110% Load | 70.838A | 9.001A | 9.094A | 3.022A | 934.727W | 88.877% | 1902 RPM | 48.5 dB(A) | 46.64°C | 0.992 |
| 11.929V | 4.999V | 3.266V | 4.965V | 1051.706W | 60.47°C | 230.33V | ||||
| Crossload 1 | 0.117A | 17.998A | 17.998A | 0.000A | 150.485W | 83.577% | 586 RPM | 14.8 dB(A) | 42.78°C | 0.947 |
| 12.028V | 5.007V | 3.276V | 5.059V | 180.055W | 51.22°C | 230.36V | ||||
| Crossload 2 | 70.832A | 1.000A | 1.000A | 1.000A | 859.565W | 90.058% | 1904 RPM | 48.6 dB(A) | 45.53°C | 0.991 |
| 11.948V | 5.005V | 3.268V | 4.992V | 954.460W | 58.03°C | 230.33V | ||||
The PSU copes well with high operating temperatures while fully loaded, and the fan-speed profile is highly relaxed at up to the 60% load test. I managed to force the fan to spin at its maximum RPM during only the full load and overload tests, where the ambient temperature is above 45°C.
Light Load Testing
In the following tests, we measure the PSU's efficiency at loads significantly lower than 10 percent of the maximum capacity (the lowest load, the 80 PLUS standard measures). This is important for when a PC is idle with its power-saving features turned on.| Efficiency at Low Loads - Corsair RM850x | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 2.908A | 0.495A | 0.499A | 0.198A | 40.027W | 85.186% | 0 RPM | <6.0 dB(A) | 0.679 |
| 11.993V | 5.059V | 3.297V | 5.058V | 46.988W | 230.34V | ||||
| 2 | 4.140A | 0.994A | 1.003A | 0.397A | 59.977W | 87.620% | 0 RPM | <6.0 dB(A) | 0.792 |
| 11.999V | 5.037V | 3.286V | 5.034V | 68.451W | 230.34V | ||||
| 3 | 5.359A | 1.490A | 1.507A | 0.597A | 80.015W | 87.776% | 0 RPM | <6.0 dB(A) | 0.858 |
| 12.048V | 5.034V | 3.284V | 5.027V | 91.158W | 230.34V | ||||
| 4 | 6.594A | 1.988A | 2.009A | 0.797A | 100.050W | 89.350% | 0 RPM | <6.0 dB(A) | 0.893 |
| 12.049V | 5.031V | 3.283V | 5.021V | 111.975W | 230.35V | ||||
Very high-efficiency levels under light loads.
Ultra-light Load Testing
The applied load in this test is only 10 W for PSUs with 500 W and less capacity. We dial in 2% of the maximum-rated capacity for all other PSUs and only run this test with 115 V input.| Efficiency at Low Loads - Corsair RM850x | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 1.184A | 0.302A | 0.303A | 0.050A | 16.977W | 77.344% | 0 RPM | <6.0 dB(A) | 0.815 |
| 11.991V | 5.058V | 3.296V | 5.059V | 21.950W | 115.15V | ||||
Intel asks for efficiency above 70% with 2% load, and the RM850x exceeds 77%. This is top performance!
5VSB Efficiency
| 5VSB Efficiency - Corsair RM850x | ||||
|---|---|---|---|---|
| Test # | 5VSB | Power (DC/AC) | Efficiency | PF/AC Volts |
| 1 | 0.100A | 0.505W | 70.531% | 0.022 |
| 5.045V | 0.716W | 230.38V | ||
| 2 | 0.250A | 1.261W | 74.926% | 0.051 |
| 5.042V | 1.683W | 230.38V | ||
| 3 | 0.550A | 2.771W | 76.759% | 0.105 |
| 5.037V | 3.610W | 230.38V | ||
| 4 | 1.000A | 5.028W | 77.917% | 0.171 |
| 5.027V | 6.453W | 230.38V | ||
| 5 | 1.500A | 7.527W | 78.138% | 0.228 |
| 5.017V | 9.633W | 230.33V | ||
| 6 | 3.000A | 14.959W | 78.274% | 0.325 |
| 4.986V | 19.111W | 230.33V | ||
The older RM850x model is slightly ahead here.
Power Consumption in Idle and Standby
| Idle / Standby - Corsair RM850x | ||||||
|---|---|---|---|---|---|---|
| Mode | 12 V | 5 V | 3.3 V | 5VSB | Power (AC) | PF/AC Volts |
| Idle | 11.989V | 5.059V | 3.296V | 5.060V | 1.834W | 0.057 |
| 230.3V | ||||||
| Standby | 0.055W | 0.001 | ||||
| 230.3V | ||||||
Vampire power stays low with 230 V input.
Jul 2nd, 2024 21:01 EDT
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