Macbook CPU never fully used - even when encoding...

Discussion in 'MacBook Pro' started by jabooth, Sep 19, 2007.

  1. jabooth macrumors member

    Joined:
    Feb 28, 2006
    Location:
    England
    #1
    :confused:

    OK, so if I encode a HD video using visualhub or render a DVD with iDVD surely I would expect both my Macbooks cores would be screaming at 100%, however checking them with activity monitor, they never do! It shows both operating around 70% - doesn't this mean I'm wasting some of the power of the macbook (30%!?!) I can't help think my encode could be done 30% faster...

    Can anyone explain this?

    Thanks,

    Harry
     
  2. stallion187 macrumors newbie

    Joined:
    Sep 17, 2007
    #2
    For one, just because your CPU is utilzed only 70%, doesn't mean that if you used it 100% you would get a 30% return.

    You would get 30% return in CPU functions, but encoding does not just involve the CPU.
     
  3. velocityg4 macrumors 68040

    velocityg4

    Joined:
    Dec 19, 2004
    Location:
    Georgia
    #3
    You are probably getting bottlenecked by your hard drive. As the file is encoded that information is getting written to your hard drive. So if your CPU only reaches a 70% load then your hard drive has likely peaked in its write speed.

    I use to run into this problem on my dual G5 with standard def video. Once I set up a RAID 0 array my storage was better able to keep pace with my CPU when compressing video in Final Cut.
     
  4. jabooth thread starter macrumors member

    Joined:
    Feb 28, 2006
    Location:
    England
    #4
    Logic told me it would be a bottleneck, but usually RAM is the problem (and having 2gigs of the stuff I presumed this was not the case).

    Does anyone else believe Hard drive speed to be the issue? Any other macbook owners find similar findings?

    Cheers
     
  5. TheMonarch macrumors 65816

    TheMonarch

    Joined:
    May 6, 2005
    Location:
    Bay Area
    #5
    Its the hardrive. Encoding a DVD, or iMovie project won't really use up more than a GB or ram, which all MBPs are equipped with.
     

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