x8 secondary PCI-E slot = x16 x8 or x8 x8 SLI config?

When does a secondary x8 slot mean that both cards will work at x8 and when does it mean that they'll work in a x16 x8 config?

Also, which is better, 2.0 x16 x4 or 2.0 x8 x8?
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More about secondary pci slot x16 sli config
  1. To answer your first question, I would have to know the motherboard in question to see exactly how the specs are phrased.

    The second question is easy. X8, x8 is much better than x16, x4. The latter will drag down the speed of the card in the x16 slot. I know. I've tried it.
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