X16 or x8 pci slot.

Hi, i am trying to find myself a motherboard and i have noticed some motherboards say sli or crossfire ready, but there is only 1 pcie x16 slot, and the others are x8. Does this mean two cards would run at x8? What kind of performance difference is there between a 16x and an 8x, vs two 16x slots?
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  1. There are boards with 2 x16 slots that will run in SLI or Crossfire at x8.
    But, according to some tests, there is no significant difference when running in x8 comparing to x16 (google for sli x16 vs x8).
  2. If it's PCIe 3.0 x8, that = PCIe 2.0 x16 speeds anyway (I know you didn't specify, I'm just saying).
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