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  1. #1

    Wman's Avatar
    Member Since
    Jul 26, 2008
    Posts
    151
    i7-2677M vs. i5-4250U
    I've been trying to decide between these two refurbished MBA's:

    Refurbished 11.6-inch MacBook Air 1.8GHz dual-core Intel Core i7 - Apple Store (U.S.)

    and

    Refurbished 11.6-inch MacBook Air 1.3GHz dual-core Intel Core i5 - Apple Store (U.S.)

    and somebody told me that the 4th gen i5 1.3 Ghz would outperform the 2nd gen i7 1.8Ghz. I compared them on Intel's website, and though I know the i5 is the newer CPU, I still don't quite understand how it could be better than an i7 with hyperthreading and so much better specs. Can somebody explain this to me?
    Have no fear. Wman is here!...or something...

  2. #2

    mrplow's Avatar
    Member Since
    Oct 01, 2007
    Location
    UK
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    6,868
    Specs:
    27" iMac i7 (2011) 10.11, Mac Mini i5 (2014), iPhone6s, Apple Watch, iPad Air 2, New AppleTV (4?)
    You have been advised correctly in that the latest i5 will outperform the older i7

    Notebookcheck.net has good cpu comparisons based on benchmarks. You can also click through to see performance in certain applications

    Mobile Processors - Benchmarklist - NotebookCheck.net Tech

    Here's your i5
    Intel Core i5 4250U Notebook Processor - NotebookCheck.net Tech

    Here's your i7
    Intel Core i7 2677M Notebook Processor - NotebookCheck.net Tech
    Not been around these parts for a while. Trying to change that . .

    Please use the reputation system if you think you've been helped - bottom left of this post

  3. #3

    Exodist's Avatar
    Member Since
    Nov 26, 2012
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    Agusan del Norte, Philippines
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    1,034
    Specs:
    L2012 Mini, i7 2.6Ghz, 8GB RAM, 256GB SSD + 1TB HDD(fusion), BenQ 32" 2.5k QHD Display
    Interesting results. I would expected them to be equal at best. Have to keep this in mind the next Mac Mini upgrade roles around.

    Joe's Photo & Video Channel on YouTube
    Lightroom, Photoshop, FCP, Gear Reviews and more...
    ***If someone helps you, please don't forget to use the reputation system.***

  4. #4

    pigoo3's Avatar
    Member Since
    May 20, 2008
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    U.S.
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    34,841
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by Wman View Post
    and somebody told me that the 4th gen i5 1.3 Ghz would outperform the 2nd gen i7 1.8Ghz. I compared them on Intel's website, and though I know the i5 is the newer CPU, I still don't quite understand how it could be better than an i7 with hyperthreading and so much better specs. Can somebody explain this to me?
    When a new computer model is released...the cpu it uses (in most cases) is not the only thing that is improved. Things like:

    - logic board architecture is improved (speedier)
    - faster graphics hardware
    - faster ram
    - etc.

    All contribute to how well (overall) an individual computer model will perform.

    As far as the comparison of cpu's themselves. With every generation of cpu...each generation is improved. So it really shouldn't be that surprising that a 4th generation i5 cpu can outperform a 2nd gen. i7 cpu.

    The performance difference between an i5 and an i7 of the exact same generation (same number of cores and same clockspeed) may not be that dramatic. For discussion's sake...maybe we're talking a difference of only 10-15%.

    So it really isn't that difficult for an i5 cpu that is 2 generations newer...to be able to out perform an older i7 cpu.

    Some additional info. The main differences between i5 and i7 cpus are:

    - i7 cpu's generally have higher clock speeds (ghz)
    - i7 cpu's generally have more cores (4 cores vs. 2 cores). You generally don't see many quad-core i5 cpu's (at least not in the Apple World).
    - i7 cpu's generally have a greater cache
    - i7 used to exclusively have "hyper-threading"

    i5 vs i7 - Difference and Comparison | Diffen

    But with multiple generations...newer i5's have faster clock speeds, newer i5's have hyper-threading, newer i5's have larger caches, etc. So basically...newer i5's can be better than older i7's.

    Combine this with better logic board architecture, faster ram, etc....and it's really not that difficult for a newer computer with a newer generation i5...to beat the performance of a computer with an older generation i7.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  5. #5

    Wman's Avatar
    Member Since
    Jul 26, 2008
    Posts
    151
    pigoo3 is your name a reference to Pigoons from Marget Atwood's Oryx and CRake?
    Have no fear. Wman is here!...or something...

  6. #6

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
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    34,841
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by Wman View Post
    pigoo3 is your name a reference to Pigoons from Marget Atwood's Oryx and CRake?
    Nope. Something completely different. Thanks for asking.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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