m3/i5/i7 throttling

Discussion in 'MacBook' started by puh, Jun 19, 2017.

  1. puh macrumors newbie

    Joined:
    Oct 31, 2014
    #1
    Does the m3 runs cooler than the i5/i7 alternatives?

    If so, might it even throttle less? And as throttling reduces the speed substantially, can the m3 even be faster in some cases? For instance if the surrounding temperature is a bit above room temperature.
     
  2. Graham Perks macrumors member

    Joined:
    Oct 2, 2003
    Location:
    Austin, TX
    #2
    I believe that the m3 wouldn't be faster. They would, at the same temp, run at the same turbo speed. The i5 & i7 can boost higher when cool.
     
  3. EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
    #3
    I've been surfing around YouTube's 2160p 4K videos and trying them out on my 2017 m3 in a Chrome browser.

    I am happy to report that 1440p24 p30, and p60 all seem to work fine without any hiccups. However, some 2160p material will stutter. The bottom of the machine will get very warm, but it does seem to work for relatively extended periods. I tried for several minutes and it doesn't seem to get much worse. CPU can be as high as 200-300% (which is possible since it's a hyperthreaded dual-core.)

    I don't know if the i7 would fare any better on the 2160p material or not. Here is one example video:



    However, since we can only display 1440p on the internal monitor anyway, a 1440p stream is most ideal in this context. Too bad Chrome is not hardware accelerated for VP9. It will eventually get there, and that hardware acceleration would be great since Kaby Lake has full 8-bit and 10-bit hardware VP9 decode support included.
     
  4. palmwangja macrumors regular

    palmwangja

    Joined:
    Apr 12, 2015
    #4
    2015 CTO isn't handling this video very well, not sure if it's CPU or network speed... :(
     
  5. 2457248 Suspended

    Joined:
    Apr 4, 2016
    #5
    that's curious, since VP9 was developed and promoted by google itself...
    but i understand that KL cpus are relatively new to the market, so i am confident they'll get there one day.
     
  6. EugW, Jun 20, 2017
    Last edited: Jun 20, 2017

    EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
    #6
    Which 2015? Did you try 1440p?

    I would imagine the 2015 m3 and 2016 m3 would fail badly with this video at 2160p. However, I'm thinking the 2016 m5 and m7 would be OK with it at 1440p. Dunno about the 2015 m5 or m7 though.
    --- Post Merged, Jun 20, 2017 ---
    I guess the battery saving solution here is just to force h.264 usage until Chrome enables VP9 hardware decode on Macs. Will that require 10.13 High Sierra?

    To force h.264 one can simply just switch to Safari, or else in Chrome one can install the h264ify extension. in either situation, the video then maxes out at 1440p, but it's h.264 which is fully hardware accelerated on Macs, including the 2015 m3. CPU usage goes way, way down, and all stutters disappear on my 2017 m3. Dunno about the 2015 m3.
     
  7. palmwangja macrumors regular

    palmwangja

    Joined:
    Apr 12, 2015
    #7
    I tested with 2160p. I heard 2015 CTO is inferior to 2016 m3 CPU-wise, believe it or not.
     
  8. EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
  9. Inseltraeumer macrumors newbie

    Joined:
    Mar 17, 2014
    #9
    What does CTO mean anyway?
     
  10. Brookzy macrumors 601

    Brookzy

    Joined:
    May 30, 2010
    Location:
    UK
    #10
    Configured to order.
     
  11. Robert Davies macrumors 6502

    Robert Davies

    Joined:
    Jul 28, 2011
    Location:
    People's Republic of Wrexham
    #11
    Just FYI.

    Max spec 2015 CTO was: 1.3ghz Intel core M with 8GB ram and 512GB SSD
     
  12. steve60549 macrumors member

    Joined:
    Nov 12, 2014
    #12
    Did anybody with a 2017 i5 or i7 try the 2160p material from EugW's post?
     
  13. EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
    #13
    Need High Sierra. I've been waiting for the Public Beta.
     
  14. steve60549 macrumors member

    Joined:
    Nov 12, 2014
  15. EugW macrumors 68020

    EugW

    Joined:
    Jun 18, 2017
    #15
    Because the OS support for HEVC hardware decode is absent in Sierra. Any decode in Sierra is purely software.
     

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