HP 619488-B21 COMP 4GB DDR3-1333MHZ ECC CL9 DRX8 UDIMMAddOn 4GB DDR3 SDRAM Memory Module 4 GB (1 x 4GB) DDR3 1333 PC3 10664 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 35 V ECC Unbuffered 240 pin DIMM Lifetime Warranty VPN: 619488 B21 AM SKU: RSC970058 UPC: 821455560105 DIMM 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance 1333 MHz speed and CL9 latency to execute routine softwares at a steady pace 240 pin pin DDR3 1333 PC3 10664 interface