How to choose RAM for your PC
Capacity, DDR4/DDR5, frequency, latency, dual-channel, and XMP/EXPO profiles explained clearly.
Capacity comes first
RAM is fast working memory. When it runs out, the system uses storage as temporary memory, which slows apps dramatically.
For a modern PC, 16 GB is the comfortable minimum, 32 GB is the balanced choice for gaming and multitasking, and 64 GB+ targets heavy video, 3D, or virtual machines.
DDR4 or DDR5
The RAM type depends on your motherboard and CPU. DDR4 and DDR5 are not physically interchangeable.
DDR5 offers more bandwidth and a better upgrade path. DDR4 can still make sense for budget builds or older platforms.
Avoid mixing different sticks when possible. A kit sold together is tested to run with the same settings.
Frequency, latency, and stability
Frequency is throughput; latency is delay. A high frequency with very high latency is not always better.
Enable XMP or EXPO in BIOS to use the rated speed. Otherwise, RAM often runs at a lower default speed.