|Kingwin Mach 1 ABT-800MA1S 800W Modular PSU|
|Reviews - Featured Reviews: Power|
|Written by Olin Coles|
|Wednesday, 23 January 2008|
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ABT-800MA1S Test Results
In the test results below, it might be necessary to explain what you are viewing. In each image the AC power ripple is represented by the yellow trace line making up the waveform. While every personal computer power supply unit available to the retail market has some degree of measurable AC power ripple, it is most important that measurable AC ripple is very minor and does not create a large peak to peak voltage (Vpp) distortion. Stable, well-regulated power is critical to system stability and hardware longevity.
AC Ripple Waveform at Light Idle Load
The waveform image above shows the AC power ripple under light idle load, which is measured inside of a 1ms recording frame. Waveform data recorded during the light idle load measurement is represented in the chart below:
AC Ripple Waveform Data at Light Idle Load
The waveform data above describes the actual measurements at light idle load. The maximum AC RMS ripple was 24.5 mV under light idle load. Note that this result is at the average of readings we have collected under light idle load.
Here are the average AC RMS ripple measurements under light idle load for power supplies we have recently tested:
The waveform image below shows the AC power ripple under heavy load. The maximum AC RMS ripple was 64.41 mV under heavy load. Note that this result falls within the least favorable of test results we have collected under heavy load.
AC Ripple Waveform at Heavy Load
Under heavy load, the Kingwin ABT-800MA1S measured an average AC RMS ripple much higher than the ripple at light idle load, which is considerably poor. The waveform data recorded during the heavy load measurement is represented in the chart below:
AC Ripple Waveform Data at Heavy Load
Because the Mach 1 800W Modular PSU Power Supply Unit offered higher than average AC ripple results in the idle readings, I didn't really expect them to get any better; and they didn't. Here are the average AC RMS ripple measurements under heavy load for other power supplies we have recently tested:
The power dropped down to no less than 12.06 V, which means that even under heavy load there is almost no chance that system stability will be affected. Under light idle load conditions the DC regulation averaged 0.19 Vpp, and degraded only slightly under heavy load to a measured 0.38 Vpp; both results are better than the average. The DC regulation data recorded at light and heavy load is displayed in the chart below:
DC Voltage Regulation Waveform Data at Light Idle and Heavy Load
At a glance, the Kingwin ABT-800MA1S offered average AC ripple fluctuation at idle but very poor ripple when placed under heavy load, with less favorable deviation in DC peak-to-peak voltage regulation. These idle readings were taken with a 25% load of 198W and the stress readings were taken with a 38% load of 306W on the 800W rated power supply output.
Many of the power supplies we test here at Benchmark Reviews have DC voltage regulation measuring above the 12V baseline more often than below. For obvious reasons, the diversion from the 12V baseline with increased voltage is more preferred than below it since dropping too far under 12V will cause a system to power off or recycle. Plainly put, no power supply is ever perfectly centered at 12V DC; instead they most often maintain a DC mean voltage higher than they are regulated at.