4 Things to Know About Choosing Between Two 8GB or One 16GB RAM Stick
Two 8GB sticks run in dual-channel mode, giving a 5-15% performance boost in games and memory-heavy tasks like video editing. A single stick runs in single-channel, leaving free performance on the table.
On a two-slot motherboard, starting with one 16GB stick lets you add another later for 32GB without wasting anything. With two 8GB sticks, you are stuck at 16GB unless you replace both.
If you know you will want 32GB within a year, go with a single 16GB stick now. This preserves the upgrade path.
If you are not sure about upgrading, or if 16GB is enough for the next few years, the dual-channel speed from two 8GB sticks is worth it. Most people will not miss the upgrade path.