1pc of 4GB PC2-6400 DDR2-800 200pin SODIMM Lifetime exchange or repair warranty against manufacturing defects. We don't use OEM or Generic module to avoid incompatibility. Guaranteed to work in your notebook or you get your money back. Compatible with: HP/Compaq EliteBook 2530p HP/Compaq EliteBook 2730P HP/Compaq EliteBook 6930P HP/Compaq EliteBook 8530W HP/Compaq EliteBook 8730W Maximum Memory: 8 GB SOCKETS: 2 MODULES MUST BE ORDERED AND INSTALLED IN PAIRS for Dual Channel mode, if supported. If 4GB is installed, the recognized memory may be reduced to 3.5GB or less (depending on system configuration and memory allocation). Maximum configurations require a 64-bit operating system.