4GB STICK For HP-Compaq HP Pavilion Desktop P6595jp P6597c P6598uk P6599uk P6600es P6600z P6601fr P6603es P6604f P6604y P6605in P6605ru P6606f P6606uk P6608f P6609it P6610f P6610it P6610me P6610y P6611de P6611es P6611pl P6612de P6612es P6612fr P6612it P6612p P6613de P6613es P6613fr P6614de P6614it P6615it P6615nl P6616at P6616f P6616it P6617c P6617cn P6617it P6618fr P6618it P6619it. DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory. Genuine A-Tech Brand. 4GB STICK DIMM DDR3 NON-ECC PC3-10600 1333MHz RAM Memory Genuine A-Tech Memory Lifetime Warranty Toll Free Technical Support 1-866-557-4527 Designed For HP-Compaq HP Pavilion Desktop. (See Compatibility List Below)