i5 vs i7 - Video Encoding on the 2012 MBA's

Discussion in 'MacBook Air' started by KasperH, Aug 8, 2012.

  1. macrumors regular

    KasperH

    Joined:
    May 26, 2011
    #1
    Hi :)

    I think it would be very interesting to see the difference between the i5 and i7 in this real world benchmark.

    I submitted my i7 results in this thread (instructions in thread as well):

    http://forums.macrumors.com/showthread.php?t=1111126

    Could someone with the i5 cpu please run the test for comparison?

    br Kasper
     
  2. macrumors 65816

    eagandale4114

    Joined:
    May 20, 2011
    #2
    The 2012 should be using quicksync for encoding. The quicksync hardware is identical on both types of processors.
     
  3. macrumors 6502a

    Joined:
    Jun 2, 2008
    #3
    As far as I know, Handbrake (and x264, which handbrake uses to encode) does not use QuickSync. It only uses CPU encoding.
     
  4. macrumors 68030

    Joined:
    Apr 10, 2003
    Location:
    A hot desert
    #4
    Afaik apple still hasn't enabled quicksync. Anyone have a source stating otherwise?
     
  5. thread starter macrumors regular

    KasperH

    Joined:
    May 26, 2011
    #5
    maybe we could try handbrake in addition to another encoder that would take advantage of Quicksync if available.

    I just want to know if the i7 makes a difference worth the price or not.
     
  6. macrumors 6502

    Joined:
    Jan 5, 2012
    #6
    I personally wouldn'tven if I could save 10-20 min per project because I don't make a living off of it, don't do it enough, and value battery life more (especially on the smaller 11"). I would set it to run and walk away and do something else. If you make a living doing this stuff then you need to judge for yourself how much your time is worth to you.
     
  7. macrumors regular

    Joined:
    Jul 3, 2012
    Location:
    Stockholm, Sweden
    #7
    I believe both facetime and airplay mirroring do use it. That airplay is using it is pretty much a given considering what all macs compatible with the feature have in common: Quicksync CPUs.

    I heard quicktime encoding would start taking advantage of it in ML but haven't found any evidence that it does. I suppose a third party encoder should be able to allow quicksync regardless, but maybe there aren't any APIs on it.

    If quicksync is THE way of encoding H.264? Hardly, not for every situation. Software encoders like handbrake usually get the upper hand when it comes to customisation parameters and picture quality. Does that matter for a youtube upload? Probably not.
     
  8. macrumors 68030

    Joined:
    Apr 10, 2003
    Location:
    A hot desert
    #8
    Thx for the info. I'll have to look into it more.
     
  9. macrumors member

    Joined:
    Jun 10, 2012
    Location:
    Earth
  10. macrumors member

    Joined:
    Jun 10, 2012
    Location:
    Earth
    #10
    MBA 13" (mid 2012) 1.8Ghz i5, 8GB RAM, 128GB SSD. Mountain Lion.

    9 mins 30 secs
    25.023638 fps

    Only attempted 1 run. Handbrake v0.9.8.
     
  11. thread starter macrumors regular

    KasperH

    Joined:
    May 26, 2011
    #11
    Thanks :)

    So the difference is about 15,5%
    Or you could say that the i5 looses around 9 minutes pr hour to the i7 in this particular task.
     
  12. macrumors member

    Joined:
    Jun 10, 2012
    Location:
    Earth
    #12
    Cinebench 11.5 on:

    MBA 13" (mid 2012) 1.8Ghz i5, 8GB RAM, 128GB SSD. Mountain Lion.

    OpenGL: 18.31 fps
    CPU: 2.60 pts
    CPU (Single Core): 1.11 pts
    MP Ratio: 2.34x

    Advanced settings used.

    Anyone with the i7 upgrade like to try?
     
  13. thread starter macrumors regular

    KasperH

    Joined:
    May 26, 2011
    #13
    Cinebench 11.5 on:

    MBA 13" (mid 2012) 2.0Ghz i7, 8GB RAM, 256GB SSD. Mountain Lion.

    OpenGL: 19.86 fps
    CPU: 3.01 pts
    CPU (Single Core): 1.27 pts
    MP Ratio: 2.37x

    Advanced settings used.
     
  14. thread starter macrumors regular

    KasperH

    Joined:
    May 26, 2011
    #14
    I just ran Novabench on the i7 as well (free in the App Store)

    Novabench Score: 756
    RAM: 178
    CPU: 467
    Graphics: 51
    Hardware tests (HD): 60
     

Share This Page