Server pushing 100mbps but cant handle the load

Dual Xeon 2.4
2GB ECC
2 x SATA2 drives (250GB WD, 16MB cache)
1Gbit uplink port

Why does the server crash when it goes above 100mbps?
(no mysql, no logs, no stats, low php usage - lots of file loading)

 

 

 

 

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