Please explain diff b/w Core 2 and i5/i7

Discussion in 'MacBook Pro' started by sfscott, Apr 13, 2010.

  1. sfscott macrumors member

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    #1
    In real (not technical) terms, what does an i5 processor deliver or improve upon from a core2 duo? What is the difference between an i5 and an i7.

    On a related note, should one infer that the GPU in the new 13" is a better GPU than the ones in the 15", or does the performance of the i5 make that a moot point?
     
  2. jav6454 macrumors P6

    jav6454

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    #2
    Three pictures for you... I'll explain in my next post.
     

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  3. Hellhammer Moderator

    Hellhammer

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    i5 just uses newer technologies such as 32nm manufacturing process and Hyper-Threading which will make it faster clock for clock.

    It's hard to explain so you would understand it but i5 is up to 30% faster than similar C2D
     
  4. jav6454 macrumors P6

    jav6454

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    Core i7

    Intel X58 is the chipset that supports the high end i7 class CPU. This CPU is mostly found in Desktops. Also referred to as LGA 1366. The features are HyperThreading, Triple Channel Memory, 40x 2.0 PCIe lanes and the fast QPI.

    Intel also has the i7 brand for socket LGA 1156, under the codename Lynnfield and Clarksfield. This is the CPU class you have in the MacBook Pros. These have Dual Channel and connect via DMI instead. Slower, but gets the job done. faster than the FSB.

    Core i5

    Same thing as Core i7 LGA 1156, except these lack the HyperThreading feature.

    Core 2 Duo

    Based off LGA775 chipset. They are much slower because of the bottlenecking FSB. Also, RAM is not connect directly to the CPU which makes things even slower. This is what 13" MacBook Pros carry.
     
  5. Smarterchild macrumors member

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    #5
    I have a simular question that i felt that i shouldnt post a whole new thread about... But i was curious the difference between the I7 processor in the 15' inch macbook pros vs. the Imac I5 dual core model.
     
  6. Hellhammer Moderator

    Hellhammer

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    #6
    That's true in desktop version...

    Mobile versions have no difference other than clock speed and 1MB of cache in i7 if Clarksfield is excluded as it's not used in MBPs
     
  7. Hellhammer Moderator

    Hellhammer

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    #7
    iMac's i5 and i7 are quad core while MBPs are dual core. MBPs' are manufactured with 32nm method which gives ~15% better performance clock for clock than 45nm in iMacs' does.

    iMacs are still WAAAAY faster than MBPs
     
  8. jav6454 macrumors P6

    jav6454

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    And slight more aggressive Turbo mode in i5s and disabled HyperThreading in i5s as well.

    That is the selling point of any i7 class CPU. HT

    Also true. Desktop versions of chips are usually 20-30% faster (personally experience number)
     
  9. m85476585 macrumors 65816

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    #9
    The mobile i5's and i7's both have HyperThreading, as far as I can tell.
    http://ark.intel.com/Compare.aspx?ids=47341,43560,43544

    The only advantage of the i7 over the i5 is a 5% higher clock speed, and larger cache, which won't make much difference for most applications.

    The i5/i7's use a different architecture than Core 2's, which makes them faster for the same clock speed. Part of that is improvements for existing instructions, and part of that is new instructions (SSE4.2) that require code optimized for them. In addition, Turbo Boost and Hyperthreading help give them a speed advantage over Core 2's.

    Most applications are not CPU-bound, but if you are doing stuff like video editing, you will probably benefit most from a Core ix.
     
  10. macgeek18 macrumors 68000

    macgeek18

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    #10
    Wait,I thought the new i5 and i7 in the new MBP's were dual core?That's what I read,so there different from the quads core i5 and i7 in the iMac 27"ers?So why do they have the same name but are different?
     
  11. mschaef macrumors newbie

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    #11
    There are a few differences:

    • Core iX has an integrated northbridge - It has faster access to memory. (Bringing it to parity with a design AMD has used for years.)
    • Core iX has an intgrated GPU. - Intel's forcing system builders to incorporate their graphics chip.
    • Core iX has a few new instructions, including encryption instructions - AES encryption performance can double, which is important if you encrypt a lot of content. (ie: full disk encryption, etc.)
    • Some Core iX chips have hyperthreading - They're still two cores, but the cores each can run two threads, for a total of four. This isn't the same as quad core, but it does let you run two cores more efficiently. (four cores can still do more work than a hyperthreaded dual core, since there are double the number of compute units with four cores.)
     
  12. Hellhammer Moderator

    Hellhammer

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    #12
    Because Intel's naming system simply sucks! There are three kinds of i5, Arrandale which is for laptops (used in MBPs), Clarkdale which is for mainstream desktops and Lynnfield which is quad core and used in iMac.

    http://en.wikipedia.org/wiki/Intel_Nehalem_(microarchitecture)#Variants
     
  13. Cali3350 macrumors regular

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    #13
    The i5 offers a "virtual" 2 cores to the operating system that allows for better use of multi-threaded code.

    Additionally, the i5 has a memory controller integrated onto the CPU that gives much better transfer rates between subsystems.

    In practical cases the i5 will be ~30% faster than the Core 2 clock for clock, however in highly threaded code (image or video manipulation, encoding, audio, etc) the difference will be higher, closer to ~60%.

    The ONLY difference between the i5 and the i7 is the amount of cache it offers. The real world performance difference is around 5% between the i5 and i7.
     
  14. jav6454 macrumors P6

    jav6454

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    #14

    Same deal with i7.

    i7 Bloomfield (Quad-Core high-end)
    i7 Lynnfield (Quad Core mid end
    i7 Gulftown (6-core High end)
    i7 Arrandale (2 Core Mid-high)
    i7 Clarksfield (Quad Core high-end)

    The last two being laptop CPUs.
     
  15. Smarterchild macrumors member

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    #15
    Opps, wrong word. I meant Quad Core.

    I am looking to get a main computer for photo editing for college and im thinking of either the 15' I7 MBP with 8gb ram and HD and anti glare screen versus the Imac quad core I7 with 8gb ram. Im thinking the MBP will be enough for computer editing though college and then i could eventually just get a external monitor (27 inch) and get a Mac pro during the end of college.

    My thought, Ipad 64gb for a mobile book for schooling and note taking along with a Macbookpro 15inch. Instead of a Pimped out Imac that i wont need dual core quite yet on and wait till i acutally go into the proffession.
     
  16. snouter macrumors 6502a

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    #16
    The iMacs with i5 and i7 chips.

    The other iMacs are pretty much laptops with a desktop hard drive and a big built in screen.
     
  17. m85476585 macrumors 65816

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    #18
    They should have named them m5 and m7 for laptops, and the m5 shouldn't have hyperthreading.
     
  18. ChronoIMG macrumors regular

    ChronoIMG

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    #19
    ^ This.
     
  19. topmounter macrumors 68020

    topmounter

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    #20
    Will the MBP i5's run cooler than the C2D? My biggest complaint with my current 2yo C2D MBP is that it gets crazy hot.
     
  20. TheRekz macrumors regular

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    #21
    I am 100% sure that it will run cooler
     
  21. m85476585 macrumors 65816

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    #22
    The iX chips should run cooler than core 2 chips. They are built on a smaller manufacturing process (32nm vs 45nm), and they presumably have better power management.
     

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