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| AMD's AM2 Platform DDR2 ... Moving On | |
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(Review by MS May 23, 2006) |
Power Consumption
In general, the new line of AM2 processors have a reduced power profile compared to even the Toledo and Manchester cores. One thing to keep in mind in this context is that the Thermal Dissipation Power is in all cases the maximum power consumption that is taken as set point for motherboard manufacturers as the minimum requirement for the VRM output. The methods used by Intel and AMD differ slightly, overall, it appears that the TDP numbers are somewhat comparable as long as they are applied to the top model in each category, with AMD's numbers maybe a bit more conservative, i.e. higher, than Intel's numbers.
Windows Idle
Power consumption [W] in WindowsXP at idle (Cool n'Quiet disabled). As mentioned earlier, one of our concerns has been that the efficacy of the 6 phase VRM may be worse than that of the 3 phase VRM used on the A8N SLI. We could accept the FX-62 drawing more power than the FX-60 at the same speed since the memory controller at 800 MHz does require a bit more power than a controller operating at 400 MHz. Compared to the 800 MHz memory frequency, even at a memory clock of 667 MHz, we see a substantial reduction in the idle power. The X2-5000 numbers are about where we would expect them, except that the X2-5000 features the smaller cache and, therefore, should draw less power than e.g. the FX60. Whatever it is, the numbers may be a little skewed but overall they are consistent with our expectations, in that the power savings of the smaller cache are mitigated by the extra power required by the memory controller running at higher speed.
Prime95
Power Consumption [W], lower is better. For simplicity reasons we have omitted the power consumption of the cold processors and we also only show the power consumption when all physical and logical cores are running instances of Prime95 as opposed to showing a 50% load on a dual core CPU or even 25% on a dual core with Hyperthreading.
The FX-62 is the first AMD CPU that actually pushes the 100 W mark, otherwise, these numbers are exactly where we would expect them, based on core speed and cache size. (Only DDR2-800 numbers are shown)
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Athlon64 X2-3800+ (dual core) |
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