Do I need identical brands for cf to work?

i have a sapphire x1900xtx and was hoping to get a cf edition card soon, but newegg doesnt have any more cf edition sapphire cards. will another brand work or do i need the same?
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More about identical brands work
  1. Different brands are fine.
  2. What mother board are you runing?

    PS. just to be on the safe side make sure that the second card also has crossfire.
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