WTH is the difference between i7 2,6Ghz vs i7 2,9Ghz?

Discussion in 'MacBook Pro' started by bdcstr, Oct 28, 2016.

  1. bdcstr macrumors newbie

    Joined:
    Oct 28, 2016
    #1
    Hello guys,

    I was wondering who could explain me what is the difference between the i7 2,6Ghz and i7 2,9Ghz on the rMBP?

    I mean.. Will I really feel the difference? A friend of mine told me: "take the highest processor, this is the only thing you can't upgrade". I fully agree, but 380€ more, for 0,3Ghz.. Is it really necessary? Or should I go on citytrip with my gf?

    Thanks for explaining me :)

    Best regards!
     
  2. borgusio macrumors regular

    borgusio

    Joined:
    Jul 22, 2011
    #2
    I have a similarr question regarding the RMBP 13": what is the difference between the i5 2.9 and the i7 3.3?

    Just speed or there are any architectural changes?
     
  3. dest macrumors member

    dest

    Joined:
    Sep 26, 2014
    Location:
    UK
    #3
    Ive been thinking a good compromise would be to get the 2.7, you gain a bit more speed but more importantly get 512gb instead of 256, and also get a slight graphics upgrade too for near enough the same price as buying the 2.6 and maxing the processor.
     
  4. ag29 macrumors 6502

    Joined:
    Oct 7, 2014
    #4
    It's all about future proofing. You won't feel the difference until you're using apps that require that power. In the future if you start to use more intensive apps, then you'll be thankful you had that processing speed.

    Once you use apps that require a lot of power, you'll definitely notice the i7 is a lot better equipped at handling those apps.

    Let's compare cars, one has a V6 and one has a 4 cylinder. If you don't take advantage of the power of the V6, then it's not going to be useful. But if you do take advantage of it, then it's a huge difference.
     
  5. The Mercurian macrumors 65816

    Joined:
    Mar 17, 2012
    #5
    Your friend is wrong. You can't upgrade the RAM or hard disk either!

    About the GHz - this is one of those things where if you have to ask you don't need it. On my MBP (couple of years old now) I went for the GHz upgrade because I often run statistics that can take hours. In that case it makes a some modest difference. If all you will do is internet, microsoft office type stuff you deffo don't need it. I might make some difference to gaming, but I don't game on my laptop so I don't really know. GPU probably more important for gaming
     
  6. borgusio macrumors regular

    borgusio

    Joined:
    Jul 22, 2011
    #6
    This does not answer my question.

    Is the i7 based on a different architecture than the i5 or it is just a speed bump?
     
  7. The Mercurian macrumors 65816

    Joined:
    Mar 17, 2012
    #7
    I cannot remember all the specifics, but one thing I can remember is that the cache is different between the two. I think the i7 has larger cache memory and possibly and extra layer of cache.

    Edit: Good comparison here - see the summary table half way down:
    http://www.makeuseof.com/tag/intel-core-i3-vs-i5-vs-i7-one-really-need/
     
  8. ag29, Oct 28, 2016
    Last edited: Oct 28, 2016

    ag29 macrumors 6502

    Joined:
    Oct 7, 2014
    #8
    I'm not sure I fully understand your question but I'll try to explain it in a way that makes more sense. For the most part, it's a big speed bump when you need it. There's no major architecture changes aside from more cache memory and hyper threading.

    In certain tasks that the i5 will struggle in, the i7 will be able to glide through. When you have many apps open or you're using an app that is resource intensive, the i7 will be a big speed bump over the i5.

    For basic things like web browsing, listening to music, having one or two apps running at a time, you will not notice any difference whatsoever.
     
  9. Paapaa macrumors member

    Joined:
    Nov 7, 2013
    #9
    Please tell us which apps you use? Safari, Mail and Office? No practical difference at all. Video editing, Photoshop, 3D rendering with heavy CPU usage? Then you might see a (like up to 12%) speed difference. Not a big one. But actually that depends on the Turbo Boost speed aswell. Which actual CPU/MacBook modes are you referring to?
     
  10. bdcstr thread starter macrumors newbie

    Joined:
    Oct 28, 2016
    #10
    I was told it was possible to buy SSD/RAM on http://www.crucial.com/ to upgrade your MacBook(Pro). Isn't that correct?

    I'm planning to use CDH/Sqoop/Hive/etc on my rMBP for data processing/analysis (and probably get back to iOS programming). Should I understand 2,9GHz would be better?
    --- Post Merged, Oct 28, 2016 ---
    Please see reply above for the usage :)

    I'm talking about the rMBP i7 quad-core.
     
  11. The Mercurian macrumors 65816

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    Mar 17, 2012
    #11
    That was true in the older models when they still had optical disk drives but has not held true for the last few years. They are so thin now that Apple doens't allow you to open them up without invalidating your warranty so that is the end of user upgrades - you need to buy it with the spec you are happy to be stuck with.

    I'm sorry I don't know those programs (?big data type stuff ?). If you are doing heavy stuff then yeah the upgrade might make some difference. But probably not a huge amount. Clock speed is about 12% more so if you think about that in a very crude way a 12hr job with constant processing task would take 11hrs. Is that worth the upgrade price to you ? (very crude analogy - there are some other differences such as extra cache that makes a difference in certain tasks)
     
  12. Samuelsan2001 macrumors 604

    Joined:
    Oct 24, 2013
    #12
    .3ghz it's that simple there is no difference other than that the they are just chips that did a bit better during manufacture and run quicker they aren't even manufactured on a different line.
     
  13. agazoo macrumors regular

    agazoo

    Joined:
    May 15, 2015
    #13
    Warranty aside, is it physically possible to upgrade/replace the RAM on new MBP?
    Can't find any info on that;
     
  14. whitedragon101 macrumors 6502a

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    Sep 11, 2008
    #14
    No its soldered to the motherboard.
     
  15. justinf77 macrumors 6502

    Joined:
    May 18, 2003
    #15
    Just clock speed. No architectural changes at all:

    http://ark.intel.com/compare/91167,91164,91166
     
  16. CarbonCycles macrumors newbie

    Joined:
    May 15, 2014
    #16
    Umm, not quite true. You're making an assumption that the software and developer wrote the code to take advantage of the chips full potential (e.g., multi-threading versus single-threading). I sincerely doubt you will see a noticeable difference unless you're doing some serious hard-core number crunching that uses the chip, bus, memory, etc.

    If you're watching movies or a casual user, save the cash and treat yourself to something with the money saved.
     
  17. borgusio macrumors regular

    borgusio

    Joined:
    Jul 22, 2011
    #17
    It is exactely what I was looking for. Same cache, same memory speed, basically the same processor at different speed steps. So the best option is the 2.9. Thanks a lot.
     
  18. David58117 macrumors 65816

    Joined:
    Jan 24, 2013
    #18
    SSD's are upgradable (but expensive), I think it's OWC who has them. Accessing it is pretty easy too.

    RAM is not upgradable.

    Obviously no one knows about the new ones yet, but most likely - don't expect to be able to do any modifications.
     
  19. Outrigger macrumors 68000

    Outrigger

    Joined:
    Dec 22, 2008
    #19
    your car engine analogy doesn't really work when comparing i5 vs i7, it is not the same order of magnitude.
     

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