Generally,
no. A power supply only puts out as much power as needed by the
system's components. In some cases, an 800W power supply may actually
use less power from the wall than a 500W power supply, depending on the efficiency
of the units. Often times, buying an "oversized" PSU is a good choice
due to it's ability to perform even under higher temperatures, a quieter
fan because the unit is delivering a lower percentage of it's total
capability and considerable system upgradability without having to worry
about having enough power when upgrading a graphics card, adding a
graphics card for SLI or additional hard drives.
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