P7550 and P8400 for MBP 13" mid-2009

Discussion in 'MacBook Pro' started by seong, Aug 7, 2010.

  1. seong macrumors 65816

    seong

    Joined:
    Feb 11, 2010
    #1
    I see two processors.
    P7550 and P8400 for both MBP 13" mid-2009.
    My sister's comp has P8400 and I have P7550.
    What's the real difference?
    I saw two threads about this, but no one had the REAL answer.
    Anyone smart enough to know this?:confused:
     
  2. RedReplicant macrumors 6502a

    Joined:
    Mar 31, 2010
    #2
    http://ark.intel.com/Compare.aspx?ids=42014,35569,

    Very minor. Basically the difference is the 8400 supports virtualization, which is more or less for running multiple OSes on the same system at the same time - think VMWare. If you are confused then it probably doesn't matter for you.
     
  3. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #3
    AFAIK, Apple used only P8400, not P7550. P7550 came a year after P8400 so it's likely just cheaper due more efficient stepping (R0) than first two revs of P8400 which had C0 and M0 though the current rev uses the same R0 stepping. The biggest difference I can see is that P8400 have two versions, for BGA479 and PGA478 sockets while P7550 supports only PGA478. Also, P8400 supports VT-x which improves virtualization performance while P7550 does not support it.
     
  4. Nice macrumors regular

    Nice

    Joined:
    Mar 17, 2010
    #4
    so which one is "better" ? i have in my mbp 13 the 7550
     
  5. Hellhammer Moderator

    Hellhammer

    Staff Member

    Joined:
    Dec 10, 2008
    Location:
    Finland
    #5
    P8400 is better but in real world, you won't notice the difference.
     

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