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LOSTCIRCUITS
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| AMD Athlon64-FX60 At the Turning Point | |
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(Review by MS January 10, 2006) |
| AMD Athlon64 X2-3800+ (Manchester) |
Software Configuration and Benchmark Results at One Glance
Software: 32-bit
Power Consumption Monitoring
We used the same power measurement setup as in our previous reports. Briefly, for isolated CPU power measurements, we used a Fluke 80i-410 AC/DC current probe in combination with a Wavetek Meterman 33XR multimeter to measure current through the isolated +12V supply lines feeding into the CPU VRM. To increase granularity of the measurements, we ran the supply lines in a triple loop through the clamp. The clamp itself was calibrated using a BK Precision model 1692, 30V 40 A DC power supply. Since there is a temperature dependency of the probe, we monitored the zero-current offset at the beginning of each measurement as well as at the end of each run. If the values drifted during we retook the measurements. Despite these precautions there are possible deviations of the read-out from the real current, however, these errors mostly affect the lower (processor idle) measurements. We estimate that the errors should not be more than 10% at the lower end of the data and less than 5% in the mid and higher data range. Moreover, since the same procedures were applied to all processors tested, there may be an offset in the absolute numbers, however, the relation of the individual cores to each other with respect to power consumption should be fairly accurate.
Bear in mind that the power measured is the input power going into the VRM rather than the regulated output power at the individual supply phases. However, the current VRMs are operating in the order of approximately 85-90% efficiency in the worst case. This means that the power measurements are slightly inflated across the board by approximately 10%.
Benchmark Results at One Glance
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Athlon64 X2-4200+ (dual core) |
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