Graphics Cards and Shared Memory

Discussion in 'MacBook Pro' started by Performa636CD, Apr 18, 2011.

  1. Performa636CD macrumors member

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    #1
    I'm trying to understand the differences between graphics cards that share memory and graphics cards with their own dedicated memory. The only reason I have been considering the 2.2, 15" MBP is its 1GB dedicated graphics memory option. Size-wise, I prefer the 13" MBP, but its graphics card is a turn off. I notice that Apple's website states "384MB of DDR3 SDRAM shared with main memory" when describing the 13" MBP's graphics capabilities. Can the graphics card in the 13" MBP use more than 384MB? If so, how much more?
     
  2. wywern209 macrumors 65832

    wywern209

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    do you rly want to know?
    #2
    no. it just reserves that much of the RAM for usage as gfx memory.
     
  3. NZed macrumors 65816

    NZed

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    #3
    thats why in my 13" 2010 MBP, the ram that could be used is only 3.75gb not 4gb because the 256 is reserved for the graphics card.
     
  4. Performa636CD thread starter macrumors member

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    #4
    Ok, but I was hoping the graphics card could use more than 384MB. On Apple's website, the footnote states, "Minimum graphics memory usage is 384MB." I was hoping maybe up to 768 or 1GB was possible if the 13" MBP had enough memory to "lend" to the graphics card.
     
  5. mulo macrumors 68020

    mulo

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    #6

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  6. Performa636CD thread starter macrumors member

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    #7
    So 384 MB isn't the limit...I was hoping that was the case. But 512MB is the maximum ceiling? I guess that's better than nothing.

    Thanks for the answers everyone.
     
  7. mulo macrumors 68020

    mulo

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    #8
    well that's what i'm wondering, it might use more if 16GB RAM is installed.
     
  8. Performa636CD thread starter macrumors member

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    #9
    Even if that's the case, going to 16GB RAM to get 1GB (I assume) of graphics memory seems like a stretch...or maybe not.

    To get the 512MB, do you need 8GB of RAM? Or would 4GB do?
     
  9. NZed macrumors 65816

    NZed

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    #10
    8gb since the MBP comes with 4gb
     

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