FSP AURUM 92+ 650 W Review

Name: FSP AURUM 92+ 650 W
Brand: FSP

crmaris

on Sep 5th, 2012,

in Power Supplies.

Manufacturer: FSP

Performance Rating & Performance per Dollar »

Ripple Measurements

In the following table, you will see the ripple levels that we measured on the main rails of the PT-650M. According to the ATX specification, the limits are 120 mV (+12V) and 50 mV (5V, 3.3V, and 5VSB).

Ripple Measurements FSP PT-650M
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	29.9 mV	22.4 mV	22.0 mV	12.5 mV	Pass
40% Load	30.8 mV	24.0 mV	22.5 mV	16.5 mV	Pass
50% Load	31.7 mV	24.2 mV	22.6 mV	16.7 mV	Pass
60% Load	34.2 mV	25.1 mV	23.3 mV	18.5 mV	Pass
80% Load	39.6 mV	26.1 mV	30.5 mV	20.8 mV	Pass
100% Load	45.5 mV	29.7 mV	32.2 mV	21.2 mV	Pass
Crossload 1	41.2 mV	51.3 mV	27.0 mV	22.6 mV	Fail
Crossload 2	36.2 mV	28.7 mV	27.0 mV	19.4 mV	Pass

Ripple suppression at normal loads is good enough. We would like to see a reading closer or even below 40 mV at +12V since this is a high-end PSU, according to FSP. During the CL1 test, the 5V rail was apparently highly stressed, leading to a ripple level that exceeded the corresponding limit. Thankfully, this test is highly unrealistic. You won't meet a similar problem in a real life scenario since the +12V rail is used almost exclusively in a contemporary PSU. All rails showed fairly good ripple suppression during the CL2 test, which is much more realistic.

Ripple at Full Load

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