HP NL797AA COMP 4GB DDR3-1333MHZ ECC 1.5V DR UDIMMAddOn FACTORY ORIGINAL 4GB DDR3 ECC 1333MHz DR SDRAM 4GB (1 x 4GB) 1333MHz ECC DDR3 SDRAM DIMM VPN: NL797AA AM SKU: RSC403914 UPC: 821455231579 4 GB memory allows you to have more programs open at a time Up to 1333 MHz memory speed with Unbuffered signal and CL9 latency for remarkable multitasking capability DDR3 SDRAM interface synchronizes electrical and clock signals for an efficient data transfer rate