פינוי ציון ארטילריה dell optiplex 990 ram type עולה על כתב סעפת
How to add RAM on DELL OptiPlex 990 MiniTower 4K - YouTube
OptiPlex 990 Ultra Small Form Factor (USFF) Removal Guide for the Coin Cell Battery, Front IO Panel, Control Panel, Intrusion Switch and Power Supply | Dell US
OptiPlex 990 Ultra Small Form Factor (USFF) Removal Guide for the Wireless Module, Internal Antenna, System Fan, Memory and Heatsink | Dell US