A-TECH 4GB STICK For HP Compaq EliteBook 2170p 2570p 8470p 8470w 8570p. SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory. Genuine Brand. 4GB STICK SO-DIMM DDR3 NON-ECC PC3-12800 1600MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP Compaq EliteBook. (See Compatibility List Below)