Cooler Master eXtreme Power Duo 650W Power Supply Review :: Performance - Power Draw

08-09-2006 · Category: Hardware - Power Supplies

By Tulatin

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.