Can I run my computer with just one stick of RAM?

Yes, the computer will boot and run normally with one stick, but you’ll be running in single-channel mode, which halves memory bandwidth. For most daily tasks like web browsing and light gaming, you probably won’t notice, but for memory-intensive work like video editing or fast-paced gaming, you’re leaving performance on the table. If you plan to add a second stick later, buy the exact same model to avoid stability headaches.