Hewlett-Packard HP 8GB PC3-12800 (DDR3-1600 MHz) SODIMM Memory (B4U40AT) - 8 GB (1 X 8 GB) - DDR3 SDRAM - 1600 MHz DDR3-1600/PC3-12800 - Non-ECC - Unbuffered - 204-pin - SoDIMM Part No.: B4U40AT