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| AMD Athlon64-FX57 The Cost of Speed | |
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(Review by MS June 27, 2005) |
| AMD Athlon 64 3800+ (Venice) |
Power Consumption
The details of how we measured isolated CPU power are given in this article. We mentioned earlier that increasing clockspeed almost exponentially increases power consumption, at least on the Venice core and, further, that the larger cache of the San Diego core is estimated to add another 10% of baseline power. Therefore, we were curious about what would happen in practice as opposed to theory:
Windows Idle
Lower is better: Keep in mind that at those power levels, the systematic error based on limited granularity of the measuring equipment can skew the results. According to oour measurements, the FX57 core draws more power than the X2-4800+, at least in idle. On the other hand, the numbers we have closely match what we would expect on the basis of overclocking the Venice core.
Temperature Compensation
Power consumption in Watt: Lower is better. We monitored a "known constant" workload by entering the CMOS setup and checking the core temperature in the hardware monitor. As the temperature increases, the overall power consumption of the core goes up. The graph shows values for a number of current Socket 939 CPUs manufactured on either 130 or 90 nm process. Once again, the FX57 draws more power than the X2-4800+.
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Athlon64 X2-4200+ (dual core) |
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