Macbook much slower when on battery

Discussion in 'MacBook Pro' started by Bossboss, Apr 16, 2011.

  1. Bossboss macrumors member

    Joined:
    Feb 25, 2011
    #1
    So I've noticed my harddrive read and write speeds are considerably slower when the laptop is running on battery.

    My 7200 reads and writes at 100/100 when plugged in, but only 60/20 when on battery.

    My Vertex 3 reads and writes at 500/500 when plugged in, but only 410/380 when on battery.

    Is there a setting somewhere that I can toggle to attain full speed when on battery?

    Thanks.
     
  2. thermodynamic Suspended

    thermodynamic

    Joined:
    May 3, 2009
    Location:
    USA
    #2
    What model MBP?

    I recall, for the Intel i7 720QM CPU, it throttles itself down to 900MHz when on battery. It's by Intel's design. (my PC laptop, a Sony Vaio VPCF115FM, does this.) So it's possible that the bus speed is going down as well, when on battery. Just a guess...
     
  3. Nameci macrumors 68000

    Nameci

    Joined:
    Oct 29, 2010
    Location:
    The Philippines...
    #3
    Yes notebooks toggle on low power when on battery to conserve energy, if you wanted performance, plug it in.
     

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