Cooler Master eXtreme Power Duo 650W Power Supply Review :: Performance - Voltages and Fluctuations

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

By Tulatin

Due to the move to an Intel based test system, testing is now being done differently. In order to attain fluctuations, the system's voltages are now being logged to a file on a per second basis, and appended with the time. By programmatically averaging this string of some 1,800 values out, the difference between the high and low voltage points can be found, and thus, so can the % variations of the supply. Generally, a better PSU will have less variation in voltages under a load.

Another change made to the test procedures is that Super Pi is now used to fully load the CPU and memory, which comprises the "Full CPU/Memory Load" area, and is joined by 3D Mark 2006 for the "Full CPU/Memory Load + 3D" Area. Though 3D mark is usually known for testing a little, than stopping, resuming, and stopping, a truly strong supply won't show voltage sags during these pauses in the testing. To the readers - remember, that as always, a lower % value in the fluctuation section is better. With systems and methods aside, it's time to churn out the numbers behind this madness.

Stock Speeds

Full CPU/Memory Fluctuations

Enermax Liberty 500W .007%
Cooler Master eXtreme Power Duo 650W .006%
Mushkin Enhanced XP650 650W .003%

Mushkin Enhanced XP650 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Cooler Master eXtreme Power Duo 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Enermax Liberty 500W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Full CPU/Memory Load + 3D

Enermax Liberty 500W .007%
Cooler Master eXtreme Power Duo 650W .006%
Mushkin Enhanced XP650 650W .003%

Mushkin Enhanced XP650 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Cooler Master eXtreme Power Duo 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Enermax Liberty 500W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V


Overclocked Speeds (CPU @ 3.83, 1.65V)

Full CPU/Memory Load

Enermax Liberty 500W .0071%
Cooler Master eXtreme Power Duo 650W .0108%
Mushkin Enhanced XP650 650W .0057%

Mushkin Enhanced XP650 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Cooler Master eXtreme Power Duo 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Enermax Liberty 500W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Full CPU/Memory Load + 3D

Enermax Liberty 500W .0087%
Cooler Master eXtreme Power Duo 650W .0108%
Mushkin Enhanced XP650 650W .0057%

Mushkin Enhanced XP650 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Cooler Master eXtreme Power Duo 650W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V



Enermax Liberty 500W


Cooler Master eXtreme Power Duo 650W Power Supply Review 3.3V

3.3V

Cooler Master eXtreme Power Duo 650W Power Supply Review 5V

5V

Cooler Master eXtreme Power Duo 650W Power Supply Review 12V

12V


Though starting strong in the middle of the pack, I think that heat may have overcome this power supply once the demand for current really ramped up. To be honest, though the inbuilt heatsinks are copper on this PSU, they are so small that they cannot adequately dissipate the heat generated, and considering that the incoming air is far from free, fresh, and optimal, the power supply began struggling. Now, though the supply is in fact still well within the clear zone, it just leaves me to wonder how hot this supply could get when faced with a task such as an FX62 and 2 x1900xtx videocards paired together. On the plus side, the separate rails SHOULD help to even things out. With that unfortunate ding in performance aside, it's time to wrap this article up.