In troubleshooting some poor network card behavior on my Dell PowerEdge T420 running Windows Server 2012 with three virtual machines on it, I came across these articles that describe problems with virtual network queues enabled on Broadcom NICs.
https://support.microsoft.com/kb/2902166/EN-US?wa=wsignin1.0
http://www.experts-exchange.com/OS/Microsoft_Operating_Systems/Server/Windows_Server_2008/Q_27985670.html
I upgraded to the latest drivers and disabled the virtual machine queues. My sample size was small and problems intermittent, so it's hard to say if I resolved the issues, but it's worth noting.
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