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      Turbo Boost Functionality on AC Power - ThinkPad W520


      On ThinkPad W520 systems, users have reported the CPU frequency is capped when Turbo Boost activates while running on AC power.


      Affected configuration

      All the following ThinkPad system running on all Operating Systems:

      • W520



      A new BIOS was released to resolve the CPU frequency capping during Turbo Boost on AC power.

      Version 1.26-1.16 (8BET46WW):

      In order to get maximum performance from the ThinkPad W520:

      1. Update the BIOS to version 8BET46WW or later.
      2. Operate on AC power using the supplied 170W adapter.


      Additional Information

      Click here to download the Intel Turbo Boost Technology Monitor.

      Only ThinkPad W520 systems are affected.


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      • Alias ID:
      • Document ID: HT051665
      • Last Updated :17 Jun 2014
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