Sapphire HD 7870 XT 2GB and Sapphire HD 7870 OC

As the title say, I can crossfire these two without trouble right? or do I need to tweak things inside for them to be compatible?
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  1. you can't crossfire them because they have different architectures. The 7870 XT can only be crossfired with 7900 GPU's.
  2. No, I am fairly certain that the 7870 XT can only crossfire with the 79xx series because it is based on the Tahiti architecture. The article states that, "you cannot pair it up to a normal Radeon HD 7870. Matching it up to any Radeon HD 7900-series card isn't a problem, though." The Powercolor 7870 Tahiti Le is the same as a 7870 XT.
    http://www.tomshardware.com/reviews/tahiti-le-7870-7930-benchmark,3401-5.html
  3. Or another 7870XT
  4. What they said ^^^^
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