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 From:  Phil Brutsche <phil at brutsche dot us>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] gigabit hardware sizing and intel 82573 driver support
 Date:  Sun, 26 Mar 2006 18:13:28 -0600
Chris Buechler wrote:
> Though I'm not extremely familiar with PCI-e, does it have the same
> shared bus limitations of PCI/PCI-X?


No.  Each PCI-E connector is seen by the OS as it's own PCI bus, and has
a dedicated link to the PCI-E host bridge.  A PCI-E x1 (single-lane)
connector is 2.5Gbit/sec full-duplex. Lanes can be bonded together for
more bandwidth.  x2, x4, x8, and x16 combinations are possible, but I
have never seen an x2 device or connector.  x16 is most commonly used
with video cards.


Phil Brutsche
phil at brutsche dot us