Solved: Dell Optiplex 990 CPU Upgrade - Page 2 - Dell Community
Swapping a 10 year old Dell PC into a Modern Gaming Case! What can Go Wrong? Optiplex 990 Build PT2 - YouTube
Dell OptiPlex 990 SFF – Specs and upgrade options
Dell Optiplex 990 MT - 2600, 1050Ti, 8GB RAM, Noctua Cooler, 700W PSU, SSD and HDD. I know cable management isn't the best, but the side panel isn't see through! Thermals are
Dell Optiplex 990 Gaming Case Upgrade Power Button Pin Out - YouTube
Optiplex 990 GPU Upgrade - Dell Community
Graphics card for Optiplex 990 SFF | Tom's Hardware Forum