| Test | iperf3 (1 stream) | iperf3 (8 streams) | CPU usage (1 Gbps) | |------|------------------|--------------------|---------------------| | Windows 7 + Intel driver 12.15 | 935 Mbps | 940 Mbps | 9–12% | | Windows 10 + legacy 12.18 driver | 912 Mbps | 928 Mbps | 14–18% | | Linux (Ubuntu 20.04, e1000e) | 941 Mbps | 943 Mbps | 8–10% | | Linux (6.8 kernel, e1000e) | 918 Mbps | 935 Mbps | 11–13% |

1. Introduction and Hardware Context The Intel 82578DC is an integrated Gigabit Ethernet controller, part of Intel’s 5 Series Express Chipset family (Platform Controller Hub, PCH). It was widely deployed on LGA1156 motherboards supporting Intel’s first-generation Core processors (Nehalem/Westmere architectures, e.g., Core i7-8xx, i5-7xx/6xx, i3-5xx).