4GB [2x2GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for the Compaq HP Business Desktop dc5800 (Genuine A-Tech Brand) 4GB [2x2GB] DDR2-800 (PC2-6400) RAM Memory Upgrade Kit for the Compaq HP Business Desktop dc5800 100% Genuine A-Tech Brand Memory 2GB DDR2-800 PC2-6400 Non-ECC Unbuffered 240 Pin 1.8V CL=6 Memory 128X8 Limited Lifetime Warranty High Quality Ram specifically designed for the Compaq HP Business Desktop dc5800