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We performed our performance measurements across a range of CPU clock rates. The test system we used incorporated the following components:
When the Pentium D 805 is overclocked, the power consumption for an idle system (Windows desktop only) climbs to 88 W. The substantial increase in input voltage necessary for stable operation is a significant contributor to this increase.
With a heavy load (100% utilization) on both CPU cores, the difference between standard clock rates and overclocking to 4.1 GHz is pretty dramatic. The resulting boost in performance comes at the cost of 216 W of actual power consumed!