Corsair RMx Series 850 W (2021) Review 35

Corsair RMx Series 850 W (2021) Review

Efficiency »

Test Setup



Primary Rails Load Regulation

The following charts show the voltage values of the main rails, recorded over a range from 60 W to the maximum specified load, and the deviation (in percent) for the same load range. Tight load regulation is an essential characteristic for every power supply because it allows for constant voltage levels despite changes in load.







5VSB Regulation



Load regulation is satisfactory at +12 V and 5 V and tight at 3.3 V.

Ripple Measurements

Ripple represents the AC fluctuations (periodic) and noise (random) found in the DC rails of PSUs. Ripple significantly decreases the life span of capacitors because it increases their temperature; a 10 °C increase can cut into a capacitor's life span by up to 50 percent. Ripple also plays an important role in overall system stability, especially when it is overclocked. The ripple limits according to the ATX specification are 120 mV (+12V) and 50 mV (+5V, +3.3V, and 5VSB).

Ripple Measurements - Corsair RM850x
Test12 V5 V3.3 V5VSBPass/Fail
10% Load4.5 mV3.5 mV2.7 mV5.3 mVPass
20% Load7.1 mV3.4 mV3.2 mV5.8 mVPass
30% Load7.0 mV3.7 mV2.8 mV5.3 mVPass
40% Load6.4 mV3.6 mV3.2 mV5.3 mVPass
50% Load6.1 mV6.1 mV7.4 mV7.3 mVPass
60% Load5.5 mV3.9 mV3.4 mV5.3 mVPass
70% Load5.6 mV4.3 mV3.8 mV6.1 mVPass
80% Load5.9 mV4.7 mV7.1 mV5.8 mVPass
90% Load5.8 mV5.2 mV8.1 mV5.9 mVPass
100% Load9.1 mV5.5 mV8.8 mV6.8 mVPass
110% Load8.9 mV5.4 mV7.4 mV6.5 mVPass
Crossload 15.0 mV4.3 mV7.5 mV5.9 mVPass
Crossload 28.2 mV5.1 mV6.0 mV6.3 mVPass


Ripple suppression is excellent on all rails.

Ripple at Full Load



Ripple at 110% Load



Ripple at Crossload 1



Ripple at Crossload 2

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Apr 28th, 2024 14:28 EDT change timezone

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