Prescott Reworked: The P4 600 Series and Extreme Edition 3.73 GHz

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Test System: Asus P5AD2-E Platinum (925XE)

Speedstep In Action

With SpeedStep enabled, Windows' power management will use ACPI to reduce the clock speed to 2.8 GHz as needed.

The following conditions must be met in order to use SpeedStep:

  • The CPU needs to support SpeedStep
  • The motherboard and BIOS need to support SpeedStep
  • Windows XP Service Pack 2 needs to be installed
  • You need to select the mobile power scheme in the Windows power management options

The Asus motherboard offers four SpeedStep options in the BIOS. Here's how they benchmarked using the Lame MP3 encoder:

Swipe to scroll horizontally
SpeedStep optionBenchmark result using Lame MP3 Encoder
Maximum Speed104 sec
Minimum Speed140 sec
Automatic112-117 sec
Disabled103 sec
Patrick Schmid
Patrick Schmid
Editor-in-Chief (2005-2006)

Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.