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OCZ EvoStream 600W |
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Performance
| OCZ EvoStream 600W | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| AC Input | 100V-240V, 12A-6A, 50-60 Hz | |||||||||
| DC Voltage | +3.3V | +5V | +12V1 | +12V2 | +12V3 | +12V4 | -12V | +5VSB | ||
| Max. Output | 20A | 30A | 15A | 15A | 15A | 15A | 1.0A | 3A | ||
| 160 W | 480 W | 12 W | 15 W | |||||||
Nice specs. Four independent 12V rails are there to make sure your power output is stable at all times.
Tested on: AMD Athlon64 3000+ @ 2000 MHz, ABIT AT8, Radeon X1900 XTX + Radeon X1900 XTX Crossfire, 2x 1024 MB DDR400, WD Raptor 36 GB.
The 12V line is exceptionally stable. Actually I haven't seen such a stable line for a long time. The 5V line is very good as well, but this is not so hard to achieve because the power draw is a lot smaller. The 3.3V line fluctuates quite a bit, but again, most power is drawn from the 12V line.
Above image shows the Ripple Voltage measurement (5 mV per vertical division, 5uS per horizontal division). With 9 mV from top to bottom, the result is very good and adds to the impression the previous voltage stability test gave. Ripple voltage was measured on the 12V line at idle.
| Standard deviation 12V | 27.38 |
|---|---|
| Standard deviation 5V | 12.20 |
| Standard deviation 3.3V | 15.04 |
| Power Factor | 0.95 |
| Ripple Voltage 12V | 9 mV |
| Power Efficiency | 72% (320W:444W) |
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.
With an efficiency of 72% the OCZ EvoStream 600W is only about average.
10% of efficiency come down to a yearly difference of $4.08 in power cost. This is assuming $ 0.10 per kWh, which is an accepted average value for power cost in the United States. We assumed 8 hours of PC usage per day, 5 days a week at 200W system average power draw.
