2x8GB kit vs single 16GB stick: Dual-channel now beats a hypothetical future upgrade

2x8GB gives you dual-channel speed immediately, which boosts games, video editing, and multitasking — a single 16GB stick runs slower in single-channel. The “future upgrade path” argument for one stick is weak because RAM prices drop, and matching a single stick later is harder than just buying a 2x16GB kit when you need 32GB. Unless you’ll add the exact same 16GB stick within months, take the performance now.