Network Card
From Amazon
DELL 540-11366 Network Interface Cards for OptiPlex 3010, 3020, 7010, 9010, 9020, XE2, Precision T1700, Precision Tower 1700
Compadvance
DELL Network Additional Broadcom
Athema Services
dell network : additional broadcom 5722 10/100/1000 mbits base-tx 540-