Solved: Optiplex 780, ram upgrade - Dell Community
Solved: Upgrading my old Optiplex 780 - Dell Community
Dell Optiplex 780 Small Form Factor - iFixit
Dell Optiplex 780 USFF Ultra Form Factor Small Main System Motherboard (DFRFW) - Newegg.com
Amazon.co.jp: Dell Optiplex 780 Small Form Factor SFF Desktop Business Computer PC (Intel Dual-Core Processor up to 3.0GHz, 8GB DDR3 Memory, 750 GB HDD, DVDRW, Windows 7 Professional) (Certified Refurbished) [並行輸入品] :
Dell OptiPlex - Wikipedia
SOLVED] - Optiplex 780 GPU/CPU upgrade | Tom's Hardware Forum