The MemoryMasters memory RAM module was specifically engineered to be compatible with the HP 2A9C Motherboard (Intel Core i3-550). Included in the package is a Genuine MemoryMasters Brand 4GB Single DDR3L PC3L-12800 2rx8 1.35v Non-ECC Memory Stick (240-pin DIMM 1600MHz) upgrade. Additional Details ------------------------------ Package quantity: 1