|Hiper HPU-4M880 & HPU-4M630 Type M PSU's|
|Reviews - Featured Reviews: Power|
|Written by Olin Coles|
|Monday, 17 December 2007|
Page 6 of 8
HPU-4M630 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 39.0 mV under light idle load. Note that these results are less favorable than the average results 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 36.2 mV under heavy load. Note that these results fall within the average of test results we have collected under heavy load.
AC Ripple Waveform at Heavy Load
Under heavy load, the Hiper HPU-4M630 630W Power Supply Unit measured an average AC RMS ripple just slightly lower than the ripple at light idle load, which is very good despite the readings. The waveform data recorded during the heavy load measurement is represented in the chart below:
AC Ripple Waveform Data at Heavy Load
Because the Hiper HPU-4M630 PSU offered above-average results in the idle readings, I didn't really expect them to get any better; but this PSU recorded better results into the heavy load tests. 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 11.75 V, which means that even under heavy load there is very little chance that system stability will be affected. Under light idle load conditions the DC regulation averaged 0.56 Vpp, and actually improved slightly under heavy load to a measured 0.50 Vpp; both results are slightly above 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 Hiper HPU-4M630 really left me unimpressed with the above-average AC ripple fluctuations and high deviation in DC peak-to-peak voltage regulation. These readings were taken with a 50% load on the 630W 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.