Pegatron Corporation 2a99 Motherboard Drivers ((install)) Link

: 2x DDR3 DIMM slots. Officially supports up to 4GB (DDR3-1066/1333), though some users report success with 8GB on 64-bit systems.

Because of this, you will find drivers on Pegatron’s public website. You must source them via the computer brand (HP/Compaq) or the chipset manufacturer. Pegatron Corporation 2a99 Motherboard Drivers

Knowing your exact specs helps you find generic drivers if the HP site lacks your specific OS: Does my motherboard support 8GB of DDR3 : 2x DDR3 DIMM slots