HP 664688-001 COMP 4GB DDR3-1333MHZ ECC SRX4 RDIMMAddOn 4GB DDR3 SDRAM Memory Module 4 GB (1 x 4GB) DDR3 1333 PC3 10600 DDR3 SDRAM 1333 MHz Single rank Memory 1. 35 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 664688 001 AM SKU: RSC633932 UPC: 195285045904 4 GB of memory to heighten your computer's performance 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance 1333 MHz speed to execute routine softwares at a steady pace