High Power Astro GD 750 W Review

Name: High Power Astro GD 750 W
Brand: High Power

crmaris

on Jul 19th, 2013,

in Power Supplies.

Manufacturer: High Power

Performance Rating & Performance per Dollar »

Ripple Measurements

You will see the ripple levels that we measured on the main rails of the AGD-750 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 High Power AGD-750
Test	12 V	5 V	3.3 V	5VSB	Pass/Fail
20% Load	24.3 mV	15.3 mV	14.5 mV	15.3 mV	Pass
40% Load	33.7 mV	20.9 mV	19.2 mV	25.0 mV	Pass
50% Load	28.7 mV	24.1 mV	21.8 mV	26.7 mV	Pass
60% Load	32.0 mV	26.0 mV	25.9 mV	27.4 mV	Pass
80% Load	37.3 mV	32.2 mV	31.8 mV	31.6 mV	Pass
100% Load	39.7 mV	38.5 mV	37.1 mV	35.9 mV	Pass
110% Load	43.1 mV	41.6 mV	40.0 mV	37.0 mV	Pass
Crossload 1	32.0 mV	20.7 mV	20.9 mV	8.4 mV	Pass
Crossload 2	35.8 mV	36.1 mV	33.3 mV	29.7 mV	Pass

Ripple suppression on the +12V rail is good enough, although we expect better results from PSUs of this price range. Things aren't so good on the minor rails since all readings at full load were close to 40 mV. The limit is, as previously stated, relative close at 50 mV. The unit's very good cap choice apparently didn't help much here, and the design needs some improvements in order to provide lower ripple. High Power should look into this matter more carefully because it is a shame for such a good unit to fall behind the competition in this crucial area. To us, ripple is probably the most important factor in a PSU's performance.

Ripple at Full Load

You can see the AC ripple and noise that 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. For all measurements, we set 0.01 V/Div (each vertical division/box equals 0.01 V) as standard.