Performance

Wow! That's some massive power delivery capability. 20 Amps on each of the four rails should be enough for any video card that will come out in the near future. It is definitely enough for G80 and R600.


Tested on: AMD Athlon64 FX-62 @ 2800 MHz, Sapphire PC-A9RD580, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire

All voltages are very stable, especially the 12V line, which goes to almost exactly 12.0V under load. The 3.3V line seems to be fluctuating a bit, but since no vital components need that voltage it does not matter at all. Nowadays all components draw most of their supply voltage from the 12V line.


When trying to measure ripple voltage I saw those strange spikes all over the 12V line. Since they reappear in regular intervals of 66 kHz (15 microseconds) I have reason to believe that they are caused by some digital circuit inside the PSU which is running at that clock frequency.


Here's a close up of one of the spikes. Their amplitude varies between 200 mV and 1100 mV. The spike is a pretty nice sinus curve. Please realize that those spikes are extremely short, only 100 nanoseconds, that's 100 billionth of a second. The light travels about one foot (30 cm) in one nanosecond.

I did notify OCZ about this and they verified that the spikes are showing on all their ProXStream units. After investigating, they came to the conclusion that this will have no effect on the power quality, longevity or stability of the PSU: "because of the extremely short duration, they should not have any adverse effect on reliability of system components".

My own testing confirms this, the unit has worked completely stable in all tests.


Standard deviation is a statistical term, which tells how far away from the average the measurements are. In other words it's the average of the average.
A large standard deviation indicates that the data points are far from the average and a small standard deviation indicates that they are close within the average.


The OCZ ProXStream has a very high efficiency of about 77%.