HP 500203-061 COMP 4GB DDR3-1333MHZ ECC 1.5V DR RDIMMAddOn 4GB DDR3 SDRAM Memory Module For Server 4 GB (1 x 4GB) DDR3 1333 PC3 10664 DDR3 SDRAM 1333 MHz Dual rank Memory CL9 1. 50 V ECC Registered 240 pin DIMM Lifetime Warranty VPN: 500203 061 AM SKU: RSC142765 UPC: 821455579176 DIMM 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 Registered signal for remarkable multitasking capability 240 pin pin DDR3