HP 647903-B21 COMP 32GB DDR3-1333MHZ ECC CL9 QR LRDIMMAddOn 32GB DDR3 SDRAM Memory Module 32 GB (1 x 32GB) DDR3 1333 PC3 10664 DDR3 SDRAM 1333 MHz Quad rank Memory CL9 1. 35 V ECC 240 pin LRDIMM Lifetime Warranty VPN: 647903 B21 AM SKU: RSC222128 UPC: 821455230107 32 GB of memory to maintain symmetry with processor and hard drive and bring out the ultimate computing experience Up to 1333 MHz memory speed to manage your routine softwares with pace and accuracy Up to 1333 MHz memory speed with CL9 latency