CF @ PCIE2.0 8x vs 16x

I was just wondering a CF 4870 on pcie2.0 8x links vs on pcie2.0 16xlinks, is there a performance gap? I own a P5Q deluxe and i am planning to get a 4870 and get another a bit later down the road.
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  1. Yes there is, but not enough to justify yet another mobo upgrade to me. P35 does x16 x4 CF; P45 x8 x8 CF; X38/48 x16 x16 CF.
  2. Whats the performance gap?
  3. thats different, we are talking about pcie 2.0 x8 vs x16, not pcie 1.1 or 1.0.
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