Sometimes, you might not know exactly which driver you need. If Device Manager just shows "Unknown Device," you can find the hardware ID.
The is not a standard retail motherboard. It’s an OEM board primarily found in HP Pavilion p6, p7, and Compaq Presario desktop series from around 2011–2013. Pegatron manufactures boards for HP, so the “2A99” is HP’s system board ID. pegatron corporation 2a99 motherboard drivers best