AMD Athlon II X3: Affordable Compromise

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TEST RESULTS

Operating Voltages

Comparison: Operating Voltages (CPU-Z)
Model
Clock Speed
Idle
Load
Athlon II X2 250
3.0 GHz
0.985V
1.308V
Athlon II X2 255
3.1 GHz
1.032V
1.358V
Phenom II X2 555
3.2 GHz
1.032V
1.352V
Athlon II X3 415e
2.5 GHz
0.959V
1.158V
Athlon II X3 435
2.9 GHz
1.009V
1.302V
Athlon II X3 440
3.0 GHz
1.082V
1.411V
Phenom II X3 705e
2.5 GHz
0.956V
1.152V
Phenom II X3 720
2.8 GHz
1.032V
1.299V
Athlon II X4 630
2.8 GHz
1.035V
1.287V

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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