CMS 16GB (2X8GB) DDR4 19200 2400MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Dell® OptiPlex 3050 All-in-One, OptiPlex 7040 Micro, OptiPlex 7440 - C109 at Amazon.com
Upgrading Dell Optiplex 7040 with more of the same 4GB RAM? : r/PcBuild
Here's my Dell Optiplex 7040, started life as an i5 6400 Inspiron 3650. Slowly upgraded piece by piece to what it is today. It's sporting an i7 6700, GTX 1650 Super, 32