Rosewill Fortress 750 W Review

Name: Rosewill Fortress 750 W
Brand: Rosewill

crmaris

on Sep 22nd, 2014,

in Power Supplies.

Manufacturer: Rosewill

Performance Rating, Performance per Dollar, Noise & Efficiency Rating »

Ripple Measurements

You will see the ripple levels we measured on the Fortress-750's rails in the following table. The limits are, according to the ATX specification, 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements - Rosewill Fortress-750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
10% Load	16.9 mV	15.4 mV	24.3 mV	12.2 mV	Pass
20% Load	14.6 mV	15.7 mV	26.5 mV	13.7 mV	Pass
30% Load	16.3 mV	17.3 mV	25.9 mV	15.2 mV	Pass
40% Load	18.1 mV	19.6 mV	27.5 mV	17.4 mV	Pass
50% Load	21.0 mV	21.4 mV	29.9 mV	19.2 mV	Pass
60% Load	23.8 mV	20.9 mV	31.1 mV	20.5 mV	Pass
70% Load	25.6 mV	23.5 mV	33.7 mV	21.6 mV	Pass
80% Load	29.4 mV	29.4 mV	35.3 mV	23.3 mV	Pass
90% Load	33.4 mV	32.7 mV	38.0 mV	24.4 mV	Pass
100% Load	37.5 mV	33.0 mV	39.0 mV	27.5 mV	Pass
110% Load	43.9 mV	40.2 mV	40.2 mV	29.6 mV	Pass
Crossload 1	19.0 mV	24.0 mV	42.1 mV	18.7 mV	Pass
Crossload 2	37.4 mV	30.4 mV	28.4 mV	22.2 mV	Pass

Ripple on the +12V rail, the most important rail, was pretty low and in line with most of the high-end competition, which, however, cost more (but also feature modular cables). While ripple suppression at 5V and 5VSB was decent, the 3.3V rail should have fared better. The minor rails obviously need more caps to cope with random AC fluctuations (aka ripple) at their outputs.

Ripple at Full Load

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