PCIe 2.0 X16 vs. X4

I have this mother board:

It has one PCIe 2.0 X 16 and one X4 slot.

If I were to buy a HD 5830 and crossfire them would I see a significant drop in performance compared to two X16 slots?

I read this page, but how credible is this information because they just taped off the pins to make it a X4 slot?


How many FPS do you think I'll get in crysis?

Last question is HD 5850 or HD 5830 CrossFire? (Considering price and performance)
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  1. x16x4 doesn't perform as good as dual x8 or x16 but still it's much better than single card(in terms of performance)
    And 2 5830's outperform one 5850 by a noticeable margin
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