|Hiper HPU-4M880 & HPU-4M630 Type M PSU's|
|Reviews - Featured Reviews: Power|
|Written by Olin Coles|
|Tuesday, 18 December 2007|
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HPU-4M880 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 24.2 mV under light idle load. Note that these results are slightly better 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 36.9 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-4M880 880W Power Supply Unit measured an average AC RMS ripple just a little higher than the ripple at light idle load, which is very good. 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-4M880 PSU offered above-average results in the idle readings, I didn't really expect them to get any better; but this PSU recorded good 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 almost no chance that system stability will be affected. Under light idle load conditions the DC regulation averaged 0.50 Vpp, and deviated only slightly more under heavy load to a measured 0.56 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 acceptable Hiper HPU-4M880 AC ripple measurements gave me the impression that 880W was a good power solution for my test system hardware. However, the above-average DC deviation in peak-to-peak voltage regulation left me unimpressed. These readings were taken with a 35% load on the 880W 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.