Mix-and-matched GPUs from different brands?

I'm considering purchasing a second 7870 GHz Edition for my PC - though I'm also split in the decision to do that or just buy a new single GPU to avoid CrossFire incompatibilities - though the card in my computer is rather scarce. I would like to know if it's okay to mix different brands, like say, an XFX 7870 with a PowerColor 7870. As they both use the same architecture designed by the same company (AMD), I imagine it would be fine so long as the clock speeds are the same to prevent bottlenecking. Is that true?
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More about matched gpus brands
  1. Using GPUs from different brands is fine as long as they are same model

    I even mixed overclocked edition of GPU with a standard one and all was fine, they just ran at the lower clock speed
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