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be quiet! Pure Power 11 FM 750 W 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 high in all 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 - be quiet! Pure Power 11 FM 750W | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 4.402A | 1.974A | 2.006A | 0.991A | 74.960W | 86.421% | 496 RPM | <6.0 dB(A) | 39.29°C | 0.837 |
| 12.122V | 5.066V | 3.289V | 5.047V | 86.738W | 43.71°C | 230.22V | ||||
| 20% Load | 9.780A | 2.963A | 3.012A | 1.190A | 150.023W | 90.884% | 499 RPM | <6.0 dB(A) | 40.30°C | 0.938 |
| 12.180V | 5.063V | 3.287V | 5.043V | 165.070W | 45.13°C | 230.22V | ||||
| 30% Load | 15.524A | 3.457A | 3.516A | 1.390A | 225.025W | 92.899% | 502 RPM | <6.0 dB(A) | 41.04°C | 0.965 |
| 12.173V | 5.062V | 3.285V | 5.037V | 242.226W | 46.69°C | 230.22V | ||||
| 40% Load | 21.283A | 3.955A | 4.022A | 1.590A | 300.036W | 93.132% | 526 RPM | <6.0 dB(A) | 41.61°C | 0.977 |
| 12.161V | 5.060V | 3.282V | 5.032V | 322.161W | 47.85°C | 230.22V | ||||
| 50% Load | 26.669A | 4.943A | 5.034A | 1.791A | 374.541W | 92.847% | 920 RPM | 20.3 dB(A) | 42.17°C | 0.983 |
| 12.150V | 5.058V | 3.279V | 5.027V | 403.395W | 48.80°C | 230.22V | ||||
| 60% Load | 32.114A | 5.935A | 6.044A | 1.992A | 449.451W | 92.518% | 1183 RPM | 27.7 dB(A) | 42.71°C | 0.986 |
| 12.133V | 5.056V | 3.276V | 5.022V | 485.798W | 49.92°C | 230.22V | ||||
| 70% Load | 37.605A | 6.927A | 7.055A | 2.193A | 524.769W | 92.106% | 1394 RPM | 32.4 dB(A) | 43.10°C | 0.988 |
| 12.117V | 5.053V | 3.275V | 5.017V | 569.743W | 51.11°C | 230.22V | ||||
| 80% Load | 43.090A | 7.923A | 8.066A | 2.395A | 600.094W | 91.680% | 1589 RPM | 36.2 dB(A) | 43.52°C | 0.990 |
| 12.107V | 5.050V | 3.272V | 5.011V | 654.553W | 52.23°C | 230.22V | ||||
| 90% Load | 48.906A | 8.422A | 8.560A | 2.396A | 674.623W | 91.276% | 1681 RPM | 37.9 dB(A) | 44.11°C | 0.990 |
| 12.107V | 5.048V | 3.271V | 5.010V | 739.106W | 53.27°C | 230.21V | ||||
| 100% Load | 54.512A | 8.919A | 9.086A | 3.003A | 749.848W | 90.753% | 1678 RPM | 37.7 dB(A) | 45.35°C | 0.991 |
| 12.110V | 5.047V | 3.268V | 4.995V | 826.256W | 55.55°C | 230.22V | ||||
| 110% Load | 60.713A | 8.921A | 9.093A | 3.005A | 825.064W | 90.301% | 1681 RPM | 37.9 dB(A) | 47.15°C | 0.992 |
| 12.112V | 5.045V | 3.266V | 4.993V | 913.677W | 57.98°C | 230.21V | ||||
| Crossload 1 | 0.115A | 14.003A | 13.998A | 0.000A | 117.903W | 83.537% | 1038 RPM | 23.8 dB(A) | 42.06°C | 0.922 |
| 12.181V | 5.048V | 3.273V | 5.080V | 141.138W | 48.22°C | 230.23V | ||||
| Crossload 2 | 62.510A | 1.000A | 1.001A | 1.000A | 770.678W | 91.259% | 1680 RPM | 37.7 dB(A) | 45.34°C | 0.992 |
| 12.115V | 5.059V | 3.273V | 5.034V | 844.499W | 55.66°C | 230.22V | ||||
There is no problem under high operating temperatures, and the PSU's fan doesn't spin at high speeds under harsh conditions, which has output noise remain low.
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 - be quiet! Pure Power 11 FM 750W | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 2.886A | 0.493A | 0.501A | 0.198A | 40.031W | 83.824% | 491 RPM | <6.0 dB(A) | 0.655 |
| 12.087V | 5.067V | 3.291V | 5.063V | 47.756W | 230.20V | ||||
| 2 | 4.112A | 0.987A | 1.000A | 0.395A | 59.980W | 84.817% | 493 RPM | <6.0 dB(A) | 0.784 |
| 12.084V | 5.067V | 3.292V | 5.059V | 70.717W | 230.20V | ||||
| 3 | 5.322A | 1.479A | 1.505A | 0.594A | 80.009W | 86.529% | 495 RPM | <6.0 dB(A) | 0.851 |
| 12.131V | 5.066V | 3.291V | 5.055V | 92.465W | 230.21V | ||||
| 4 | 6.522A | 1.973A | 2.007A | 0.792A | 100.039W | 87.138% | 496 RPM | <6.0 dB(A) | 0.890 |
| 12.181V | 5.065V | 3.289V | 5.051V | 114.805W | 230.21V | ||||
Efficiency levels are high with light loads, and the fan spins at low speeds, so you won't hear it.
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 - be quiet! Pure Power 11 FM 750W | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 1.064A | 0.245A | 0.245A | 0.051A | 15.136W | 73.780% | 428 RPM | <6.0 dB(A) | 0.776 |
| 12.059V | 5.063V | 3.295V | 5.061V | 20.515W | 115.11V | ||||
The PSU easily breaks the 70% mark with 2% load.
5VSB Efficiency
| 5VSB Efficiency - be quiet! Pure Power 11 FM 750W | ||||
|---|---|---|---|---|
| Test # | 5VSB | Power (DC/AC) | Efficiency | PF/AC Volts |
| 1 | 0.100A | 0.503W | 71.045% | 0.021 |
| 5.025V | 0.708W | 230.25V | ||
| 2 | 0.250A | 1.256W | 75.481% | 0.047 |
| 5.022V | 1.664W | 230.25V | ||
| 3 | 0.550A | 2.760W | 77.289% | 0.098 |
| 5.018V | 3.571W | 230.25V | ||
| 4 | 1.000A | 5.011W | 78.653% | 0.163 |
| 5.011V | 6.371W | 230.24V | ||
| 5 | 1.500A | 7.506W | 79.085% | 0.223 |
| 5.003V | 9.491W | 230.23V | ||
| 6 | 3.000A | 14.941W | 79.668% | 0.334 |
| 4.980V | 18.754W | 230.24V | ||
The 5VSB rail is efficient.
Power Consumption in Idle and Standby
| Idle / Standby - be quiet! Pure Power 11 FM 750W | ||||||
|---|---|---|---|---|---|---|
| Mode | 12 V | 5 V | 3.3 V | 5VSB | Power (AC) | PF/AC Volts |
| Idle | 12.050V | 5.063V | 3.297V | 5.061V | 2.132W | 0.058 |
| 230.2V | ||||||
| Standby | 0.061W | 0.002 | ||||
| 230.2V | ||||||
Vampire power stays low.
Dec 27th, 2024 11:55 EST
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