You can find the full suite of drivers (Chipset, BIOS, LAN, and Audio) on the ThinkCentre M81 Support Page .
4 DDR3 slots supporting up to 32GB of RAM (1333 MHz). Audio: Realtek ALC662 High Definition Audio. Networking: Intel 82579 Gigabit Ethernet. Driver Categories & Sources Lenovo Is6xm Rev 1.0 Motherboard Drivers
Which would you like?
: This board typically uses the Realtek ALC662 codec. While Windows 10/11 often installs a generic driver, a dedicated version provides better control over the 5.1-channel HD output. Network (LAN) : It features an Intel 82579LM You can find the full suite of drivers