Why is 8GB slower than 4GB?

Discussion in 'MacBook Pro' started by CW Jones, Sep 9, 2010.

  1. CW Jones macrumors 6502

    Joined:
    Nov 24, 2009
    Location:
    CT
    #1
    My buddy and I just did Xbench tests on our laptops... His is a 2010 15" i7 with 4GB of RAM and a 128GB Apple SSD. Mine is a 2009 15" 2.66GHz C2D with 8GB of RAM and a 320GB 5400rpm HDD. His results when we run JUST the XBench for memory was almost twice what mine was! Same bus speed and everything... Why would this be? Does the processor or SDD/HDD effect it as well for some reason?
     
  2. Hrududu macrumors 68020

    Hrududu

    Joined:
    Jul 25, 2008
    Location:
    Central US
    #2
    Xbench is in dire need up an update. Its over 4 years old now and I doubt its really that accurate with modern systems being so different than they were back then. More than likely its a fluke, or since the program isn't 64 bit its not addressing all your RAM properly.
     
  3. CW Jones thread starter macrumors 6502

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    Nov 24, 2009
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    CT
    #3
    Wouldn't it not both our systems be 64-bit and effected equally?
     
  4. Eddyisgreat macrumors 601

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    Oct 24, 2007
    #4
    You are completely forgetting that the i series has a different memory controller than the core 2 duo. You can't compare the two.
     
  5. Ruahrc macrumors 65816

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    Jun 9, 2009
    #5
    4GB mmeory is the max that can be addressed by 32bits of space, whereas 8 can only be fully utilized by a 64-bit addressing system.
     
  6. RedReplicant macrumors 6502a

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    Mar 31, 2010
    #6
    Correct info right here.
     
  7. CaoCao macrumors 6502a

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    Jul 27, 2010
    #7
    XBench is old, needs update
     
  8. CW Jones thread starter macrumors 6502

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    Nov 24, 2009
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