How does crossfire/sli memory work?

If I have to 1gb cards in crossfire or SLI, is that essentially the same memory wise as having a 2gb single card? Just talking about the memory here, do the 2x 1gb cards function the same with their combined 2gb memory as a single card with 2gb memory?
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More about crossfire memory work
  1. No. 1GB of VRAM for both cards still means 1GB of VRAM in total because the same textures are loaded to both cards.
  2. 1G card running Sli or Crossfire mode..its still running on 1G memory..
    only memory bandwidth will double
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