[SI-LIST] PCI Express 2.0 diff. impedance

I am told that PCI Express 2.0 signals at 5 Gb/s live in an 85 Ohm 
differential impedance environment,
however I find no mention of this in the PCI Express Base Specification 
Revision 2.0 from the PCI SIG.
Was this requirement dropped at some point?

Thanks

-Arrigo Benedetti

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