Yes, you can mix laptop memory if they have the same size and speed.
Yes, you can mix laptop memory if they have the same size and speed.
You can add another 8GB RAM module, such as GoodRam 8GB 3200 MHz, to your laptop. It will work as long as it matches the specifications and is compatible with your system.
When the requirements align, it should function properly. Differences in specifications may limit performance, but you're unlikely to notice. Just as with other parts, keep a record of your purchase until you've tested it thoroughly and everything seems okay.