Why i7 Is Better Than i5?

Discussion in 'iMac' started by kevhui, Nov 12, 2009.

  1. kevhui macrumors regular

    Apr 24, 2008
    I saw all i7 have 1MB L2 cache and 8MB L3 cache, while i5 750 has the same L2 and L3, so why i7 is better?

    Similarly, I saw Core 2 Quad Q9550/Q9650 has 12MB L2, so isn't it better?
  2. iMacKeung macrumors member

    Nov 2, 2009
    CPU is not all about the size of cache or clock speed....it's all about architecture of the system

    and also i7 has hyperthreading, which i5 doesn't, it should perform better in multi-threaded programs
  3. spinnerlys Guest


    Sep 7, 2008
    forlod bygningen
  4. Learjet035 macrumors 6502

    Feb 24, 2005
    S. Floriduh
    i5 is better for now because it's sitting on my desk
  5. kevhui thread starter macrumors regular

    Apr 24, 2008
    Thanks for your information.

    I thought hyperthreading is not a new technology, and real number of cores should be better than hyper?
  6. belvdr macrumors 603

    Aug 15, 2005
    No longer logging into MR
  7. iMacmatician macrumors 601

    Jul 20, 2008
    Two physical cores are better than one physical core HyperThreaded for two virtual cores. However, two physical cores are not better than two physical cores HyperThreaded for four virtual cores.
  8. fobfob macrumors 6502

    Oct 15, 2008
  9. kroeks macrumors regular

    i think this is the best one until they review the systems side by side
  10. Kronie macrumors 6502a


    Dec 4, 2008
    So true.
  11. macchiato2009 macrumors 65816

    Aug 14, 2009
    i7 is better than i5 because marketing says so :D :rolleyes:

    and i can predict the future...

    i9 will be better than i7

    i5 better than i3
  12. kroeks macrumors regular

    why is the PSPgo better then the PSP?
    Everything has its pro's and cons'
  13. Scott6666 macrumors 65816


    Feb 2, 2008
    Does anyone know if i7 will be sold out of the stores? It seems to be a BTO option off the i5 from the website. Usually this means not in stores. Given all the interest though I thought maybe...
  14. morficus macrumors member

    Oct 26, 2009
    North East, USA
    i5 does not support hyperthreading while the i7 does (hyper-threading = 2 execution threads per core, in place of 1)

    Core 2 Quad does not have a level-3 caching (read a bit about cache levels if you're not clear on how L1, L2 and L3 cache differ from one another). But from what I remember from my schooling: bigger cache = harder to manage and can become ineffective (that's why L1 cache is so small but darn fast, while L3 is bigger but slower)

    also, i5 and i7 don't have a FSB so some of the memory communication overhead has been eliminated (since it's built in to the CPU now)

    the days of cache size and clock speed are long behind us. the paradigm has shifted to multi-threading and memory management.

    nope, no i7's will be in retail stores - only base i5's
    simply because it's a BTO option for the i5 (which you already pointed out)
    maybe the the future, but not now at least
  15. morficus macrumors member

    Oct 26, 2009
    North East, USA
  16. 53x12 macrumors 68000


    Feb 16, 2009

    I agree, the title sucks. However other members posted good info that is worth reading and will be rehashed in this one.
  17. MJD Dawg macrumors 6502

    Apr 27, 2009
    Junction of the Pacific, Juan de Fuca & NA Plates
  18. Indyrs2 macrumors newbie

    Feb 18, 2008
    Also with the i7 you get to see this in istat when you handbrake a movie. A thing of beauty.

  19. Shivetya macrumors 65816

    Jan 16, 2008
    It does not compare the i5 to i7 .... so
  20. DavieBoy macrumors 6502


    Jan 8, 2009
    New Jersey
    I was told that it will not be sold in stores. I however can not imagine them not selling it in stores. Don't most of us walk into the apple store wanting the best. I want the best so I have to wait 2 weeks?
  21. IgnatiusTheKing macrumors 68040


    Nov 17, 2007
    das Fort
    I think this article (previously linked to by spinnerlys) provides a pretty good comparison of the two. It seems that most people won't really notice the difference between i5 and i7, but if you're working with video a lot, you will.

    One thing I've not been able to find anywhere is a good list of programs that utilize hyperthreading. I'm leaning heavily toward the i5, but if I was to be assured that the Adobe CS Design suite (Photoshop, Illustrator, InDesign, etc.) was going to make use of HT in CS5, I would seriously consider going with the i7.
  22. emptyCup macrumors 65816


    Jan 5, 2005
    From the fine print of the BearFeats article:

    We haven't forgotten to answer the question, "What about the iMac Core i5?" Geekbench 64 bit results posted on the Geekbench Browser indicate that the Core i7 is 35% faster. Until we can get our hands on a Core i5, we can only hypothesize that it is worth the paying 10% more for the Core i7 to get 35% more CPU crunching power.​

    Hope this helps.
  23. andiwm2003 macrumors 601


    Mar 29, 2004
    Boston, MA
    ughhy.....i want it...

    how long does it take to handbrake a movie? 2 min?

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