How does vram work on multi GPU setups?

narpuppy

Baseband Member
Messages
22
Location
Florida
From what I understand, if you are running 2 670s in sli for example, the vram is limited to only 1 of the cards. Why is this? Why can't 1 card render half of the pixels using its own vram and the other card render the other half using its?

It just seems so wasteful to have around 2gb of gddr5 memory just sitting there.
 
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