4GB KIT (4 x 1GB) for Dell Optiplex 210L 740 GX280 Small Form Factor GX320 GX520 GX620 DT/MT/SFF GX620 Ultra Small Form Factor. DIMM DDR2 Non-ECC PC2- | cixneo.com
Dell F8098 - Motherboard / System Board for OptiPlex GX620 - CPU Medics
Installing a CPU (Processor) in a Dell Optiplex GX620 Motherboard - YouTube