HP 664691-001 COMP 8GB DDR3-1600MHZ ECC SRX4 RDIMMAddOn 8 GB DDR3 SDRAM Memory Module 8 GB (1 x 8GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Single rank Memory CL11 1. 50 V ECC Registered 240 pin RDIMM Lifetime Warranty VPN: 664691 001 AM SKU: RSC480307 UPC: 821455324325 Editing high resolution pictures, rendering 3D graphics and playing the latest games is not a big deal with RDIMM 8 GB of memory that effortlessly manages them 1600 MHz of memory speed with Registered signal and CL11 latency