Can I mix different RAM sizes (like two 8GB sticks and one 16GB stick)?

Yes, you can mix RAM sizes to get 32GB total, but you lose full dual-channel performance. The system will run in “flex mode,” where only part of the memory pairs up, causing a performance hit in memory-intensive tasks like gaming or video editing. For basic office work, you won’t notice. Matched pairs are worth the extra $20 for best performance.