The Intel 82578DC is a Gigabit Ethernet controller designed by Intel Corporation. It's a single-chip, low-power, and highly integrated network interface controller (NIC) that supports 10/100/1000 Mbps Ethernet connectivity.
Tested on a Dell OptiPlex 780 (Core i5-650, 4GB DDR3, SSD): intel 82578dc gigabit network driver
Official support peaked during the era, but compatibility continues through various legacy packages and community-maintained drivers. Intel® 82578DC Gigabit Ethernet PHY The Intel 82578DC is a Gigabit Ethernet controller