How does VRAM Stack?

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Corkeye

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Aug 30, 2013
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I know VRAM doesnt stack when you SLI/CF two cards or more. But how come it stacks in the card if its dual GPU?
 
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VRAM does stack and is individually addressable within the x86 memory space, but each GPU is responsible for rendering alternating frames. Alternating frames are usually very similar to each other and thus require very similar sets of data. Each GPU has far more bandwidth to its own memory than it does to the memory on the other GPU (which requires it to snoop through the CPU's memory controller) , so most of the scene elements end up getting duplicated as it cannot be shared in an effective fashion.

Electronics marketing departments love larger numbers, so slapping "6GB DDR5" on a box looks a lot better than "3GBx2...
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Pinhedd

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Aug 7, 2007
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VRAM does stack and is individually addressable within the x86 memory space, but each GPU is responsible for rendering alternating frames. Alternating frames are usually very similar to each other and thus require very similar sets of data. Each GPU has far more bandwidth to its own memory than it does to the memory on the other GPU (which requires it to snoop through the CPU's memory controller) , so most of the scene elements end up getting duplicated as it cannot be shared in an effective fashion.

Electronics marketing departments love larger numbers, so slapping "6GB DDR5" on a box looks a lot better than "3GBx2 DDR5". They're pandering to simpletons that have money.
 
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