The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.

    how well does the C2D run 64 bit?

    Discussion in 'Hardware Components and Aftermarket Upgrades' started by hmmmmm, Aug 31, 2006.

  1. hmmmmm

    hmmmmm Notebook Deity

    Reputations:
    633
    Messages:
    1,203
    Likes Received:
    0
    Trophy Points:
    55
    i've been hearing that since the C2D doesn't have macrofusion or something like that that it's not good at running 64 bit

    does anyone know if the C2D runs faster on 32 bit or 64 bit?

    or can anyone provide some links to shed some like onto this matter?

    Thanks
     
    hmmmmm, Aug 31, 2006
    #1
  2. burningrave101

    burningrave101 Notebook Deity

    Reputations:
    109
    Messages:
    756
    Likes Received:
    0
    Trophy Points:
    30
    Can you provide any links to where you are hearing that?
     
    burningrave101, Aug 31, 2006
    #2
  3. fiish

    fiish Notebook Enthusiast

    Reputations:
    0
    Messages:
    24
    Likes Received:
    0
    Trophy Points:
    5
    I think you're referring to a feature called Macro-Ops Fusion. This is implemented in both desktop (Conroe) and laptop (Merom) Core 2 Duo processors, and basically what it does is combine certain bunches of instructions in order to process them in a single cycle - this makes the processor run faster. It is not related to the processor's ability to run 64-bit applications.

    The Core 2 Duo has EM64T support - it is this feature that allows it to run 64-bit applications. Excepting a few unique instructions it is the same as AMD's 64-bit instruction set, and Microsoft's 64-bit (x64) OSes will run on both brands of processors.
     
    fiish, Aug 31, 2006
    #3
  4. Chris27

    Chris27 Notebook Deity

    Reputations:
    421
    Messages:
    955
    Likes Received:
    0
    Trophy Points:
    30
    It runs faster in 64 bit but it doesn't gain as much performance going from 32 bit to 64 bit as the amd 64's. the C2d's still hold the performance crown in 64 bit though
     
    Chris27, Aug 31, 2006
    #4
  5. hmmmmm

    hmmmmm Notebook Deity

    Reputations:
    633
    Messages:
    1,203
    Likes Received:
    0
    Trophy Points:
    55
    thanks all
     
    hmmmmm, Sep 1, 2006
    #5
  6. Jalf

    Jalf Comrade Santa

    Reputations:
    2,883
    Messages:
    3,468
    Likes Received:
    0
    Trophy Points:
    105
    Actually, it is related. Core 2 is unable to perform Macro-ops fusion in 64-bit mode. (XBitLabs and a few other sites have reported on this, and Intel's documentation confirms it)
    However, it's usually not a big deal. It means a few percent performance loss, which is compensated for by the couple of things that are more efficient in 64-bit mode.

    Overall, it works fine in 64-bit mode, although the performance boost it gets from 64-bit mode is less than what an Athlon 64 gets, it still ends up with great performance.
     
    Jalf, Sep 1, 2006
    #6