4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for the Dell Optiplex GX620 Ultra SFF (Genuine A-Tech Brand) 4GB [2x2GB] DDR2-667 (PC2-5300) RAM Memory Upgrade Kit for the Dell Optiplex GX620 Ultra SFF 100% Genuine A-Tech Brand Memory 2GB DDR2-667 PC2-5300 Non-ECC Unbuffered 240 Pin 1.8V CL=5 Memory 128X8 Limited Lifetime Warranty High Quality Ram specifically designed for the Dell Optiplex GX620 Ultra SFF