I'm having major issues with the USB3.0 driver support for the DX79SI, and it looks to be interfering with the “Intel 82579LM Gigabit Network Connection”.
The system frequently hangs when loading Windows 7. Once I finally get it to load successfully, I notice that the “Intel 82579LM Gigabit Network Connection” was not able to start successfully. Also, an extra “Renesas Electronics USB 3.0 Host Controller” device appears under “Universal Serial Bus controllers”. That leaves 2 USB 3.0 Host Controllers & 1 Hub in Device Manager when I only remember 1 of each with a fresh install.
Intel, I’d be happy to provide any additional info you need about my set-up. The only new components in this system are the motherboard and processor. This issue happens with previous and fresh installs of Windows 7 x64.