HP B4U40AT COMP 8GB DDR3-1600MHZ 1.5V DR SODIMMAddOn 8GB DDR3 SDRAM Memory Module For Notebook 8 GB (1 x 8GB) DDR3 1600 PC3 12800 DDR3 SDRAM 1600 MHz Dual rank Memory CL11 1. 50 V Non ECC Unbuffered 204 pin SoDIMM Lifetime Warranty VPN: B4U40AT AA SKU: RSC935433 UPC: 821455233511 8 GB capacity is enough to execute all memory hungry programs simultaneously SoDIMM 8 GB bar will run multiple applications together and enhance your computer's performance 1600 MHz memory speed for great multitasking