R7PPW - 255W For Dell Optiplex 3020 / 9020 SFF Small Form Factor Power Supply - 365PowerSupply.com - Replacement Laptop Power Adapters,Desktop Power Supply & Server Workstation PSU.
Amazon.com: NT1XP YH9D7 255W L255AS-00 PS-3261-2DF Replacement Power Supply for Dell Optiplex 3020 7020 9020 Precision T1700 Small Form Factor (SFF) Systems R7PPW 3XRJ0 V9MVK FP16X H255ES-00 D255AS-00 : Electronics