Required for sound functionality (High Definition Audio).
https://dlcdnet.asus.com/pub/ASUS/mb/socket1150/B85M2/ pegatron b85m2 drivers link
If the Pegatron-specific links don't work, you can often use generic Intel drivers since the motherboard uses standard Intel architecture: Required for sound functionality (High Definition Audio)
: Integrated Realtek RTL8105E 100M Network Card and 6-channel high-definition audio. How to Install Intel Chipset Drivers Manually pegatron b85m2 drivers link
: Offers a dedicated support section for motherboards, including the B85-M2 model.
Be extremely cautious with BIOS links for this motherboard. Because this board was made for various different vendors, a BIOS file meant for an Acer version of the B85M2 might brick a version meant for an HP machine. Only update the BIOS if you are experiencing hardware compatibility issues with newer CPUs or RAM. Installation Tips