OCZ ProXStream 1kw OCZ1000PXS ATX PSU

Testing & Results

Load & Efficiency Testing

To provide our readers with the most accurate results, Overclock3D uses a custom built PSU load tester on all reviews. This not only gives much more reliable results than the testing methods employed by other sites, but also allows for all current and future review results to be compared side-by-side.

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains (Mains Draw) against the power consumed by the OC3D power supply stress tester (PSU Load). These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment.

  0% 50%100%
+3.3v Rail
0w33w 66w
+5.0v Rail
0w50w 100w
+12v Rails

OCZ ProXStream 1kw Load Tests OCZ ProXStream 1kw Efficiency Tests

It has to be said that the ProXStream performed surprisingly well in our tests when placed under a full load of 886w. Unfortunately we couldn't stress the unit up to the full manufacturers rating of 1000w, but even at 886w it was clear to see that the unit wasn't breaking into a sweat. The +5v rails suffered the most during the tests - dropping from 5.03v to 4.83v, but still remained within ATX specifications.

Efficiency tests are performed by measuring the wattage consumed by the power supply at the mains against the power (in watts) consumed by the OC3D power supply stress tester. These results may not be 100% accurate, but have proven to be extremely close to results obtained from professional equipment. With this in mind, our testing equipment indicated that the ProXStream was able to manage a fairly average 81.26% rating when placed under 443w load, and a more respectable 82.19% when under 886w load.

Heat Output Testing

In our continuing efforts to make power supply reviews more thorough, rather than simply checking voltage stability, Overclock3D will now be recording the temerature of each PSU as it undergoes testing. Temperature recordings will be taken from the underside of the PSU's outer casing at 0%, 50% and 100% load levels in an attempt to gauge how much heat is likely to radiate into the end-users case.

OCZ ProXStream 1kw Temperature Tests

It's hard to deny that heat is a big problem on the ProXStream 1kw unit. With only a single 80mm fan trying to keep 2 layers of components cool it's no surprise that the ProXStream is one of the hottest PSU's under load that we've tested to date. Installing an additional 80mm fan on the other side of the unit may have alieveated this, but unfortunately due to the extremely cramped interior, I very much doubt this could have been possible. If you don't have sufficient cooling inside your PC case, the additional heat dump from the ProXStream could prove to be a slight problem.

Noise Level Recordings

Possibly the hardest part of any PSU review is summarising the level of noise given out by the unit. The threshold for what is considered 'noisy' varies from person to person and therefore what I may consider a quiet unit, another person may consider extremely loud. A common way to resolve this issue is to use a dBA meter to measure the units noise level, however this doesn't take into account the pitch (type) of noise emitted and whether it is likely to irritate end users.

For this reason OC3D records all power supplies at idle and load in wav format for you to make your own informed decisions. All recordings are taken at 30cm away from the PSU and outside of a PC case. You will need to remember that noise levels will be reduced by varying amounts once the PSU has been installed inside your PC enclosure.

0% Load Recording - Download
50% Load Recording - Download
100% Load Recording - Download

As you can hear from the recordings above, the ProXStreme is not a quiet unit. Even under 0% load it seems like the 80mm fan is running at near full speed. Why this amount of airflow is required when there is no stress on the unit I'm not sure, but this issue certainly rules out the ProXStreme as a viable option for the silent PC enthusiast.

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Most Recent Comments

02-03-2007, 05:52:49

"Today I'll be looking at OCZ's first entry into the 1000w domain with their brand new ProXStream 1kw unit based around a standard ATX sized casing. Will it be any better than the other similarly sized 1kw units we've tested recently? Read on to find out."


02-03-2007, 06:41:29

Fairly decent performance there, quite like the looks of it tooQuote

02-03-2007, 06:47:25

Mr. Smith
Not impressed tbh - enermax ftw... Agreed, fairly decent performance, but who wants fairly decent when you can have unequivocal top notch performance elsewhere?

Decent review though...Quote

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