Most of us use one or two M.2 slots on our motherboard to install NVMe SSDs, and call it a day. After all, storage is what M.2 slots are known for. However, that’s not all they’re compatible with. You can realistically use a vacant M.2 slot on your motherboard to install one of several types of expansion cards, some of which I’ve already covered in the article about non-SSD devices compatible with an M.2 slot. In this list, I want to cover some other expansion cards you can install instead of wasting your spare M.2 slots.