Macbook much slower when on battery

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

  1. Bossboss macrumors member

    Feb 25, 2011
    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?

  2. thermodynamic Suspended


    May 3, 2009
    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


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

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