The Dell OptiPlex 3060 SFF uses DDR4-2666 across two slots — 32 GB ceiling

The Dell OptiPlex 3060 SFF uses DDR4-2666 across two slots — 32 GB ceiling

Two SO-DIMM slots, DDR4 non-ECC at 2666 MHz, max 32 GB via 2×16 GB. The 2666 MHz speed is a notch below the 3200 ceiling you see on newer DDR4 machines, and 32 GB is the firm ceiling. Fine for standard office workloads, but don’t plan on memory-heavy virtualization — you’ll hit the wall fast.