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Seasonic Connect 750 W Review - The Solution for Cable Management
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.
Not the most efficient design, especially with 2% load. However, you cannot call it bad either. It is just that the competition is fierce.
10%–110% Load Testing
These tests reveal the PSU's load regulation and efficiency levels under high ambient temperatures. They also show how the fan speed profile behaves under tough operating conditions.| Load Regulation & Efficiency Testing Data - Seasonic SSR-750FA | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 4.425A | 1.988A | 1.981A | 0.983A | 74.961W | 86.357% | 0 RPM | <6.0 dB(A) | 45.19°C | 0.822 |
| 12.059V | 5.030V | 3.331V | 5.089V | 86.804W | 40.19°C | 230.35V | ||||
| 20% Load | 9.881A | 2.985A | 2.976A | 1.184A | 150.036W | 90.386% | 570 RPM | 18.9 dB(A) | 41.05°C | 0.913 |
| 12.056V | 5.027V | 3.327V | 5.071V | 165.994W | 46.34°C | 230.34V | ||||
| 30% Load | 15.679A | 3.485A | 3.474A | 1.386A | 225.041W | 91.592% | 554 RPM | 18.3 dB(A) | 41.90°C | 0.944 |
| 12.053V | 5.024V | 3.325V | 5.052V | 245.700W | 47.76°C | 230.34V | ||||
| 40% Load | 21.478A | 3.984A | 3.974A | 1.590A | 300.052W | 91.947% | 685 RPM | 22.4 dB(A) | 42.41°C | 0.959 |
| 12.051V | 5.022V | 3.324V | 5.034V | 326.333W | 48.60°C | 230.34V | ||||
| 50% Load | 26.901A | 4.982A | 4.970A | 1.795A | 374.606W | 91.882% | 890 RPM | 29.7 dB(A) | 42.59°C | 0.967 |
| 12.048V | 5.018V | 3.320V | 5.015V | 407.702W | 49.50°C | 230.34V | ||||
| 60% Load | 32.358A | 5.986A | 5.971A | 2.000A | 449.537W | 91.573% | 1172 RPM | 38.4 dB(A) | 43.00°C | 0.973 |
| 12.044V | 5.015V | 3.317V | 4.996V | 490.905W | 50.81°C | 230.33V | ||||
| 70% Load | 37.851A | 6.987A | 6.974A | 2.211A | 524.882W | 91.190% | 1355 RPM | 40.5 dB(A) | 43.17°C | 0.976 |
| 12.041V | 5.011V | 3.313V | 4.976V | 575.589W | 51.39°C | 230.31V | ||||
| 80% Load | 43.345A | 7.991A | 7.975A | 2.422A | 600.199W | 90.693% | 1733 RPM | 47.4 dB(A) | 43.32°C | 0.979 |
| 12.038V | 5.007V | 3.310V | 4.956V | 661.793W | 52.33°C | 230.31V | ||||
| 90% Load | 49.205A | 8.495A | 8.464A | 2.429A | 674.701W | 90.272% | 1927 RPM | 50.5 dB(A) | 44.44°C | 0.981 |
| 12.035V | 5.005V | 3.308V | 4.941V | 747.406W | 54.19°C | 230.31V | ||||
| 100% Load | 54.873A | 8.998A | 8.984A | 3.055A | 749.944W | 89.762% | 1942 RPM | 51.1 dB(A) | 45.64°C | 0.982 |
| 12.032V | 5.002V | 3.306V | 4.911V | 835.478W | 55.81°C | 230.30V | ||||
| 110% Load | 61.135A | 9.000A | 8.986A | 3.065A | 825.169W | 89.306% | 1949 RPM | 51.5 dB(A) | 46.63°C | 0.983 |
| 12.030V | 5.001V | 3.305V | 4.896V | 923.979W | 57.44°C | 230.30V | ||||
| Crossload 1 | 0.117A | 12.000A | 11.998A | 0.000A | 101.063W | 85.200% | 615 RPM | 20.3 dB(A) | 42.82°C | 0.873 |
| 12.048V | 5.006V | 3.299V | 5.096V | 118.619W | 49.01°C | 230.35V | ||||
| Crossload 2 | 62.015A | 1.000A | 0.999A | 1.000A | 760.046W | 90.406% | 1942 RPM | 51.1 dB(A) | 45.24°C | 0.982 |
| 12.041V | 5.023V | 3.333V | 4.970V | 840.705W | 55.97°C | 230.30V | ||||
I noticed that the PF readings are not that high, especially at high loads. The PFC converter needs a little tuning to better match the voltage and current waveforms.
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 representing when a PC is idle with its power-saving features turned on.| Efficiency at Low Loads - Seasonic SSR-750FA | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 2.892A | 0.497A | 0.493A | 0.196A | 40.019W | 80.125% | 0 RPM | <6.0 dB(A) | 0.689 |
| 12.057V | 5.036V | 3.337V | 5.113V | 49.946W | 230.25V | ||||
| 2 | 4.118A | 0.995A | 0.991A | 0.392A | 59.968W | 84.692% | 0 RPM | <6.0 dB(A) | 0.775 |
| 12.058V | 5.033V | 3.334V | 5.105V | 70.807W | 230.26V | ||||
| 3 | 5.353A | 1.490A | 1.485A | 0.589A | 79.986W | 87.140% | 0 RPM | <6.0 dB(A) | 0.829 |
| 12.057V | 5.030V | 3.332V | 5.097V | 91.790W | 230.26V | ||||
| 4 | 6.586A | 1.988A | 1.983A | 0.786A | 100.022W | 88.692% | 0 RPM | <6.0 dB(A) | 0.863 |
| 12.059V | 5.029V | 3.330V | 5.090V | 112.775W | 230.27V | ||||
At light loads, efficiency levels are satisfactory, and the fan does not spin, which means noise output is minimal.
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. We only run this test with 115 V input.| Efficiency at Low Loads - Seasonic SSR-750FA | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Test # | 12 V | 5 V | 3.3 V | 5 VSB | Power (DC/AC) | Efficiency | Fan Speed | PSU Noise | PF/AC Volts |
| 1 | 1.080A | 0.209A | 0.211A | 0.052A | 15.043W | 61.248% | 0 RPM | <6.0 dB(A) | 0.824 |
| 12.056V | 5.037V | 3.338V | 5.118V | 24.561W | 115.15V | ||||
It would be nice to see over 70% efficiency with 2% load.
5VSB Efficiency
| 5VSB Efficiency - Seasonic SSR-750FA | ||||
|---|---|---|---|---|
| Test # | 5VSB | Power (DC/AC) | Efficiency | PF/AC Volts |
| 1 | 0.100A | 0.512W | 68.725% | 0.037 |
| 5.121V | 0.745W | 230.33V | ||
| 2 | 0.250A | 1.279W | 71.935% | 0.084 |
| 5.116V | 1.778W | 230.33V | ||
| 3 | 0.550A | 2.811W | 75.626% | 0.160 |
| 5.109V | 3.717W | 230.33V | ||
| 4 | 1.000A | 5.100W | 76.199% | 0.243 |
| 5.098V | 6.693W | 230.33V | ||
| 5 | 1.500A | 7.632W | 76.312% | 0.300 |
| 5.087V | 10.001W | 230.33V | ||
| 6 | 3.000A | 15.153W | 76.069% | 0.380 |
| 5.051V | 19.920W | 230.33V | ||
The 5VSB circuit needs an upgrade for the sake of better efficiency.
Power Consumption in Idle and Standby
| Idle / Standby - Seasonic SSR-750FA | ||||||
|---|---|---|---|---|---|---|
| Mode | 12 V | 5 V | 3.3 V | 5VSB | Power (AC) | PF/AC Volts |
| Idle | 12.056V | 5.037V | 3.337V | 5.121V | 9.596W | 0.297 |
| 230.3V | ||||||
| Standby | 0.069W | 0.003 | ||||
| 230.3V | ||||||
Vampire power is low.
Dec 23rd, 2024 05:20 EST
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