8GB stick vs 16GB stick for OptiPlex 3070: 8GB stick wins for dual-channel performance and cost

Adding another 8GB stick gives you 16GB in dual-channel mode, making everyday tasks snappier. A 16GB stick gives you 24GB total, but only the first 16GB runs dual-channel—the rest is single-channel with minimal real-world gain. The 8GB stick is cheaper and keeps the option for matched sticks later.