HP Pavilion dv4-1000ea supports a Maximum of 8GB of PC2-6400 RAM. The standard configuration from the manufacturer for a Pavilion dv4-1000ea has 1GB/2GB/3GB/4GB of RAM and has 2 bank(s) of memory socket(s) for a total 2 memory socket(s). Installing the largest capacity memory module in each memory socket will provide maximum system performance.