Amazon.com: Microsoft Authorized Refurbisher- Dell Optiplex 3040 Micro Form Factor PC Intel i3-6100T 3.2GHz. 8GB DDR3 RAM,256 SSD, WiFi, with Dual Dell 24 P2419HLCD Windows 10 Pro (Renewed) : Electronics
Dell Optiplex 3040 Micro Computer, Intel Core i5-6500T Gen 6 (2.50 GHz), 8GB DDR3 RAM, 500GB SATA HDD, WiFi, Bluetooth, HDMI, Displayport, Windows 10
RAM upgrade for Dell optiplex 3040 : r/homelab
Restored Gaming Dell OptiPlex 3040 Small Form Computer Desktop PC Intel Core i5 Processor, 16GB ddr4 Ram, 1TB Hard Drive, NVIDIA GeForce GT 1030 DDR5, New 20 inch LCD, WiFi, Windows 10 (Refurbished) - Walmart.com
Dell Optiplex 3040 SFF Intel Core i3-6100 3.7GHz 4 GB RAM No HDD No OS | eBay
A-Tech 8GB Memory RAM for Dell OptiPlex 3040 SFF - DDR3L 1600MHz PC3-12800 Non ECC DIMM 2Rx8 1.35V - Single Desktop Upgrade Module (Replacement for A8733212) at Amazon.com
Dell OptiPlex 3040 SFF Intel Core i5-6500 3.2GHz up to 3.6GHz 16GB 250GB SSD Win 10 Pro