Page 1:be quiet! Dark Power P11-1200 Power Supply Review
Page 2:Packaging, Contents, Exterior And Cabling
Page 3:A Look Inside And Component Analysis
Page 4:Load Regulation, Hold-Up Time And Inrush Current
Page 5:Efficiency, Temperature And Noise
Page 6:Cross-Load Tests And Infrared Images
Page 7:Transient Response Tests
Page 8:Ripple Measurements
Page 9:Performance, Performance Per Dollar And Noise Ratings
Page 10:Pros, Cons And Final Verdict
Cross-Load Tests And Infrared Images
Our cross-load tests are described in detail here.
To generate the following charts, we set our loaders to auto mode through our custom-made software before trying more than 1,500 possible load combinations with the +12V, 5V and 3.3V rails. The load-regulation deviations in each of the charts below were calculated by taking the nominal values of the rails (12V, 5V and 3.3V) as point zero.
Load Regulation Charts
As you can see from the efficiency graph above, for a large part of its operational range, the PSU's efficiency is above 90 percent. This is why you pay extra to get a Platinum PSU — to have increased efficiency for a wider operational range.
Did you notice the blue waterfall in the +12V rail's ripple chart? This depicts an increased ripple region. This is most likely caused by the operation of the LLC resonant controller, which forces the main switching FETs to operate in PWM mode at lower loads, while at normal loads it uses FM mode.
Toward the end of the cross-load tests, we took some photos of the PSU with our modified FLIR E4 camera, which delivers 320x240 IR resolution (76,800 pixels).
During the full-load and overload tests, with a close to 49 C ambient temperature, the temperatures inside the PSU were at very high levels naturally.
- be quiet! Dark Power P11-1200 Power Supply Review
- Packaging, Contents, Exterior And Cabling
- A Look Inside And Component Analysis
- Load Regulation, Hold-Up Time And Inrush Current
- Efficiency, Temperature And Noise
- Cross-Load Tests And Infrared Images
- Transient Response Tests
- Ripple Measurements
- Performance, Performance Per Dollar And Noise Ratings
- Pros, Cons And Final Verdict