Final answer:
To upgrade memory, match the new modules with those already installed and use the type, size, and speed supported by the motherboard.
Step-by-step explanation:
When upgrading memory, it's important to use the type, size, and speed supported by the motherboard. To do this, you need to match the new modules with those already installed. For example, if your motherboard supports DDR4 memory with a speed of 2400 MHz, make sure you purchase DDR4 modules with the same speed.