Crossfirex quad mobo but only 2 pci-e x16 slots?

I have an ASRock 970 EXTREME3 AM3+ AMD 970 mobo coming but, I'm conused.

this board supports crossfirexX and crossfireX quad but, only has 2x pci-e x16 slots. How does it support quad then?

Also, looking at the manual it shows two amd gpu cards with a single cf bridge and another option with two cards connected (same two cards) connected by two cf bridges.

I'm totally confused.
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