Is it okay to mix different RAM sizes, like a 16GB and a 32GB stick?

Yes, you can mix a 16GB and a 32GB stick for 48GB total, but you’ll probably lose full dual-channel performance. The system runs the first 32GB in dual-channel and the rest in single-channel, causing a 5–10% hit in memory-heavy tasks like video editing or gaming. Mismatched speeds or timings can also cause issues, so use sticks from the same manufacturer or speed rating, and run a memory test afterward.