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Cooler Master Real Power M850 850W |
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Performance
The UL number E166947 reveals that the PSU is made by OEM manufacturer Enhance Electronics for Cooler Master.
| Cooler Master RealPower M850 850W, RS-850-ESBA | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| AC Input | 100V-240V, 6.3-12A max., 50-60 Hz | ||||||||||
| DC Voltage | +3.3V | +5V | +12V1 | +12V2 | +12V3 | +12V4 | +12V5 | +12V6 | +5VSB | ||
| Max. Output | 25A | 30A | 18A | 18A | 28A | 28A | 18A | 18A | 3.5A | ||
| 191W | 768W | 17.5W | |||||||||
| 850W | |||||||||||
Tested on: AMD Athlon64 FX-62 @ 2800 MHz, ABIT AT8, 2x 512 MB DDR400, WD Raptor 36 GB, Radeon X1900 XTX + Radeon X1900 XTX Crossfire
While the 12V line is very stable, the 3.3V and 5V lines fluctuate quite a bit under load. All voltages remain within the limits of the ATX specification however, so there is nothing to worry.
The ripple voltage is exceptionally small with only 6 mV, which is one of the best results I've seen so far.
| Standard deviation 3.3V | 9.07 |
|---|---|
| Standard deviation 5V | 4.48 |
| Standard deviation 12V | 6.48 |
| Power Factor | 1.00 |
| Ripple Voltage 12V | 6.0 mV |
| Power Efficiency | 83.6% (353W:422W) |
For easier comparison between power supplies we put the (normalized) line regulation standard deviation into graphs.
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.
So the smaller the standard deviation is, the better the line regulation.
