Refurbished Dell Optiplex 9010-SFF WA1-0415 Desktop PC with Intel Core i5-3570 Processor, 16GB Memory, 2TB Hard Drive and Windows 10 Pro (Monitor Not Included) - Walmart.com
Solved: Increase of RAM - Dell Community
Dell OptiPlex 9010 SFF vs. Dell OptiPlex 9020 SFF Comparison
4GB DDR3 Memory Upgrade for Dell Optiplex 9010 MT/DT/SFF/USFF PC3-12800 240 pin 1600MHz Desktop RAM (PARTS-QUICK Brand) at Amazon.com