HP 501541-001 COMP 4GB DDR3-1333MHZ ECC 1.5V DR UDIMMAddOn 4 GB DDR3 SDRAM Memory Module For Server 4 GB (1 x 4GB) DDR3 1333 PC3 10600 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 50 V ECC Unbuffered 240 pin UDIMM Lifetime Warranty VPN: 501541 001 AM SKU: RSC129904 UPC: 821455579336 UDIMM 4 GB of memory makes a perfect symmetry with your latest model processor and boosts up your computer's performance Up to 1333 MHz memory speed with CL9 latency to manage your routine softwares with pace and accuracy