Can I use different ram cards?

Yes, you can use different RAM cards in your computer, but it's important to ensure they are compatible with your motherboard and have similar specifications, such as speed (measured in MHz) and type (e.g., DDR4). Mixing RAM with different specifications may lead to instability or cause the system to run at the speed of the slowest module. Additionally, using RAM from different manufacturers may affect performance, so it's generally recommended to use matched pairs for optimal performance.