Start with confirming the system supports DDR4 memory and the use of SO-DIMM modules. Check the number of available slots and the maximum supported capacity per Dell’s official spec. Ensure you purchase RAM with matching speed for best performance and consider dual-channel configurations to optimize throughput on this compact form factor.

Opt for DDR4 SO-DIMM modules that fit the mini PC’s specs and avoid ECC RAM unless the system explicitly supports it. If the motherboard supports higher capacities, choose matching pairs to enable dual-channel operation. Depending on your workload, adding 8–16 GB increments often yields a noticeable performance boost for multitasking.

ECC RAM is generally not required for consumer-grade Dell OptiPlex mini systems unless you rely on servers or highly sensitive workloads. Most mainstream configurations perform well with non-ECC memory. Always confirm with your specific motherboard and CPU compatibility before purchasing.

Most standard configurations offer multiple slots enabling dual-channel setups, which improves bandwidth and system responsiveness. Use matched sticks in paired slots to maximize performance. If you’re upgrading, keep the existing modules in place and add identical modules to fill the slots properly.

Power down completely, unplug, and ground yourself to prevent static damage. Open the case, align the notches, and firmly seat the RAM until the latches click. Avoid touching gold contacts and ensure the module is fully locked in. Reassemble, power on, and verify the BIOS recognizes the new memory.

Purchase from reputable retailers offering DDR4 SO-DIMM RAM with clear compatibility listings for Dell OptiPlex mini systems. Look for modules with warranties and straightforward return policies. Keep your receipt and packaging in case you need to exchange for a different speed or capacity.