be quiet! Pure Power 11 700W PSU Review

1. Introduction2. Packaging, Contents & Exterior3. Teardown & Component Analysis4. Load Regulation, Hold-Up Time & Inrush Current5. Efficiency, Temperature & Noise6. Protection Features & DC Power Sequencing7. Cross-Load Tests & Infrared Images8. Transient Response Tests9. Ripple Measurements10. EMC Pre-Compliance Testing11. Performance, Value, Noise & Efficiency12. Final Analysis13. View All Pages

To learn how we measure ripple, please click here.

The following table includes the ripple levels we measured on the L11-CM-700's rails. The limits, according to the ATX specification, are 120mV (+12V) and 50mV (5V, 3.3V, and 5VSB).

Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	5.7 mV	12.7 mV	11.6 mV	15.5 mV	Pass
20% Load	13.1 mV	17.4 mV	17.3 mV	18.5 mV	Pass
30% Load	16.6 mV	19.9 mV	21.5 mV	17.9 mV	Pass
40% Load	18.0 mV	21.9 mV	22.7 mV	11.4 mV	Pass
50% Load	20.8 mV	24.7 mV	25.4 mV	12.5 mV	Pass
60% Load	21.8 mV	26.2 mV	28.4 mV	11.4 mV	Pass
70% Load	24.1 mV	27.6 mV	32.2 mV	14.5 mV	Pass
80% Load	25.7 mV	30.9 mV	33.6 mV	15.6 mV	Pass
90% Load	33.3 mV	33.0 mV	36.5 mV	16.6 mV	Pass
100% Load	43.3 mV	35.8 mV	41.6 mV	18.2 mV	Pass
110% Load	59.6 mV	37.9 mV	44.4 mV	19.9 mV	Pass
Crossload 1	18.2 mV	27.5 mV	24.4 mV	19.3 mV	Pass
Crossload 2	39.0 mV	33.8 mV	37.5 mV	18.9 mV	Pass

The ripple suppression cannot meet the competition in this price range, with both the Seasonic SSR-750FX and Bitfenix BWG750M units achieving much better results (with only exception the 5VSB rail where the BWG750M falls a bit behind).

The +12V rail goes close to 45mV under full load at high ambient, which is a satisfactory result, however the minor rails, especially 3.3V, clearly need more filtering caps.

Ripple Oscilloscope Screenshots

The following oscilloscope screenshots illustrate the AC ripple and noise registered on the main rails (+12V, 5V, 3.3V and 5VSB). The bigger the fluctuations on the screen, the bigger the ripple/noise. We set 0.01 V/Div (each vertical division/box equals 0.01V) as the standard for all measurements.

Ripple At Full Load

Ripple At 110-Percent Load

Ripple At Cross-Load 1

Ripple At Cross-Load 2

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