4GB 2X2GB RAM Memory for Compaq HP Business Desktops Pro 3505 Microtower, Z220 Small Form Factor DDR3 ECC UDIMM 240pin PC3-12800 1600MHz Black Diamond Memory Module UpgradeCategory: 009 RamCompaq HP Business Desktops Z220 Convertible Minitower, Z220 Small Form Factor compatible Black Diamond memory 4GB 2X2GB DDR3 ECC UDIMM 1600MHz. Compatible computer model: Compaq HP Business Desktops Pro 3505 Microtower, Z220 Convertible Minitower, Z220 Small Form Factor. Black Diamond Memory offers the most extensive line of memory solutions today. With our decades of experience specializing in memory, Black Diamond Memory is a proven manufacturer to the semiconductor industry. Our great products combined with our world class service and support have helped us to where we are today. When you have an Black Diamond memory chip, you can count on it being the best available memory for your system. Our system specific Branded Memory line delivers in performance, and is designed to be guaranteed in compatibility with your system. Each of our memory chips come with a lifetime warranty for your peace of mind. Use our Upgrade Configurator to easily find the correct memory module for your system. Please keep in mind that this memory will ONLY work on the models listed above. 15% Restocking fee will apply for non-defective items.