Adamanta 16GB (2x8GB) Memory Upgrade for Dell OptiPlex 5040 Desktop Mini Tower DDR3L 1600Mhz PC3L-12800 UDIMM 2Rx8 CL11 1.35v RAM 16GB (2x8GB) DDR3L 1600 Mhz Desktop Memory 204pin Low Voltage Dual Rank Module. Every module is backed by a limited lifetime warranty. We always have hundreds in stock! Free technical support from our experienced technicians. Every single module is fully tested by the manufacturer. May not work on all devices. Please check your device's specifications before purchasing. May require a x64 bit OS to upgrade. Our experienced technicians can verify if these parts will work for you.