Gigabyte UD850GM 850 W Review - No Fireworks

Name: Gigabyte UD850GM 850 W
Brand: GIGABYTE
Price: 140 USD

crmaris

on Jun 6th, 2022,

in Power Supplies.

Manufacturer: GIGABYTE

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 essential for every power supply because it allows for constant voltage levels despite changes in load.

5VSB Regulation

Load regulation is tight enough at +12 V, but not the minor rails.

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 a vital role in overall system stability, especially when it is overclocked. According to the ATX specification, the ripple limits are 120 mV (+12V) and 50 mV (+5V, +3.3V, and 5VSB).

Ripple Measurements - Gigabyte UD850GM
Test	12V	5V	3.3V	5VSB	Pass/Fail
10% Load	5.4 mV	9.7 mV	7.5 mV	19.4 mV	Pass
20% Load	7.5 mV	12.1 mV	8.7 mV	21.0 mV	Pass
30% Load	22.6 mV	13.0 mV	9.4 mV	21.7 mV	Pass
40% Load	16.9 mV	12.7 mV	10.2 mV	22.3 mV	Pass
50% Load	16.1 mV	14.6 mV	12.1 mV	23.8 mV	Pass
60% Load	15.7 mV	15.9 mV	14.1 mV	23.3 mV	Pass
70% Load	14.5 mV	16.9 mV	16.7 mV	23.7 mV	Pass
80% Load	15.3 mV	20.1 mV	23.4 mV	23.7 mV	Pass
90% Load	16.9 mV	21.9 mV	24.1 mV	25.5 mV	Pass
100% Load	27.4 mV	23.8 mV	26.6 mV	28.8 mV	Pass
110% Load	29.0 mV	25.0 mV	30.1 mV	30.8 mV	Pass
Crossload 1	8.9 mV	20.6 mV	29.8 mV	18.6 mV	Pass
Crossload 2	7.8 mV	17.6 mV	16.5 mV	17.2 mV	Pass
Crossload 3	5.9 mV	13.8 mV	25.2 mV	17.1 mV	Pass
Crossload 4	26.0 mV	15.0 mV	9.5 mV	24.2 mV	Pass