4GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for the Compaq HP Business Desktop 6000 Pro (Genuine A-Tech Brand) 4GB DDR3-1066 (PC3-8500) RAM Memory Upgrade for the Compaq HP Business Desktop 6000 Pro 100% Genuine A-Tech Brand Memory 4GB DDR3-1066 PC3-8500 Non-ECC Unbuffered 240 Pin 1.5V CL=7 Memory Limited Lifetime Warranty High Quality Ram specifically designed for the Compaq HP Business Desktop 6000 Pro