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Re:BeagleBone Black: A 1-GHz computer for $45 by ChuckMcM on Friday May 03, 2013 @01:49AM (#5649025)
Ethernet is built into the SOC [1] and brought out to a phy. It can do gigabit Ethernet. With the wireless dongle in the USB plug it was doing 10.5MB/sec (megabytes per second) according to scp.

[1] http://www.ti.com/lit/ds/symlink/am3358.pdf

Re:BeagleBone Black: A 1-GHz computer for $45 by mansr on Friday May 03, 2013 @10:57AM (#5650412)
Note that the BeagleBone has a 100Mbps phy.