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Before I get into any form of actual performance testing, one factor which is important to look at is the overall power consumption of a system. By using high draw components such as a massively overclocked Prescott, 2GB of Performance memory, and a fast videocard, it's rather easy to make the system pull a few hundred watts from the wall. The question then becomes which supply can pull the fewest watts, yet still provide the same power?
Stock Speeds
Idle Draw
| Enermax Liberty 500W |
148.5, Power Factor .990 |
| Cooler Master eXtreme Power Duo 650W |
153.4, Power Factor .664 |
| Mushkin Enhanced XP650 650W |
159.2, Power Factor .630 |
Full CPU/Memory Load
| Enermax Liberty 500W |
210.3, Power Factor .993 |
| Cooler Master eXtreme Power Duo 650W |
214.9, Power Factor .686 |
| Mushkin Enhanced XP650 650W |
220.5, Power Factor .657 |
Full CPU/Memory Load + 3D
| Enermax Liberty 500W |
236.4, Power Factor .996 |
| Cooler Master eXtreme Power Duo 650W |
244.0, Power Factor .675 |
| Mushkin Enhanced XP650 650W |
247.5, Power Factor .666 |
Overclocked Speeds (CPU @ 3.83, 1.65V)
Idle Draw
| Enermax Liberty 500W |
191.0, Power Factor .992 |
| Cooler Master eXtreme Power Duo 650W |
195.1, Power Factor .674 |
| Mushkin Enhanced XP650 650W |
199.1, Power Factor .635 |
Full CPU/Memory Load
| Enermax Liberty 500W |
288.9, Power Factor .995 |
| Cooler Master eXtreme Power Duo 650W |
300.0, Power Factor .700 |
| Mushkin Enhanced XP650 650W |
297.8, Power Factor .632 |
Full CPU/Memory Load + 3D
| Enermax Liberty 500W |
330.0, Power Factor .996 |
| Cooler Master eXtreme Power Duo 650W |
332.0, Power Factor .707 |
| Mushkin Enhanced XP650 650W |
344.0, Power Factor .710 |
Though Cooler Master's offering does not feature any form of power factor correction (yet does feature a nice, large gap inside the casing where an Active PFC PCB would fit perfectly), it does draw a little more power than the Enermax unit across the board. Yet, even with what seems to be less advanced circuitry, it manages to stay in the middle of the pack - drawing more than the oddly efficient Enermax, but still putting away less power than Mushkin's unit. The upshot here, of course, is that it provides more power than Enermax's offering, yet considerably less than Mushkin's, though the wattage ratings are the same. With the draw aside, let's see how the PSU's circuitry handled the shifts in load.
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