Mixing RAM sizes vs matched pairs: You'll lose dual-channel but it usually works fine

You can mix a 16GB and 32GB stick for 48GB total, but the first 32GB runs in dual-channel and the rest in single-channel, costing 5–10% performance in heavy tasks. Mismatched speeds or timings can cause throttling or crashes, but if sticks are from the same manufacturer or speed rating, it’s practical for everyday use.