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TEST RESULTS
Operating Voltages
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Comparison: Operating Voltages (CPU-Z)
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Model
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Clock Speed
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Idle
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Load
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Athlon II X2 250
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3.0 GHz
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0.985V
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1.308V
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Athlon II X2 255
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3.1 GHz
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1.032V
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1.358V
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Phenom II X2 555
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3.2 GHz
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1.032V
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1.352V
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Athlon II X3 415e
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2.5 GHz
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0.959V
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1.158V
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Athlon II X3 435
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2.9 GHz
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1.009V
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1.302V
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Athlon II X3 440
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3.0 GHz
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1.082V
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1.411V
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Phenom II X3 705e
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2.5 GHz
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0.956V
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1.152V
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Phenom II X3 720
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2.8 GHz
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1.032V
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1.299V
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Athlon II X4 630
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2.8 GHz
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1.035V
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1.287V
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Before we jump into power consumption numbers, please note the operating voltages
of the processors tested today as sort of a disclaimer. Different samples of
the same processor often run at slightly different operating voltages which
can greatly affect power consumption. With Cool'n'Quiet and C1E enabled, most
AMD chips typically run with a core voltage of about 1.0V when idle and 1.325V
on load.
Power Consumption
All the processors tested delivered less than 50W DC system power consumption
when idle, except surprisingly, the Phenom II X3 705e. The Athlon II X2s, X3
415e, and X3 440e did better than the rest when idle and during x264 playback.
The measurements taken from the AUX12V connector mirror the results for system
power — the Phenom IIs all use more power when idle and during video playback.
On load, the X3 'e' variants came out on top with the 45W X3 415e beating out
the 65W X3 705e by 8W.
Thermals
For our thermal test, each CPU was paired with the Scythe Kabuto with its stock
fan spinning at ~800 rpm. Measurements were taken using the motherboard's sensor
via SpeedFan after the temperature stabilized on load.
No surprises here, the CPU load temperature is proportional to load power consumption.
With a quality heatsink, none of these processors should be difficult to cool
at stock settings.
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