HP B4U37AA COMP 8GB DDR3-1600MHZ 1.5V CL11 DR UDIMMAddOn 8GB DDR3 SDRAM Memory Module 8 GB (1 x 8GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 50 V Non ECC Unbuffered 240 pin DIMM Lifetime Warranty VPN: B4U37AA AA SKU: RSC107718 UPC: 821455321805 Editing high resolution pictures, rendering 3D graphics and playing the latest games is not a big deal with 8 GB of memory that effortlessly manages them 1600 MHz of memory speed with CL11 latency skillfully manages the variety of apps