If your computer indicates that it has 16 GB of available RAM but is using only 5.9 GB, it may be normal depending on the current workload and running programs. Here are some reasons why this might be happening:
1. **Current Workload:** If you're not running many programs or tasks that require a lot of memory, it's normal for only a portion of the RAM to be used.
2. **Automatic Memory Management:** The operating system can dynamically allocate the required amount of memory for running tasks. If there isn't much demand, it might not use the entire available capacity.
3. **System Settings:** Check if there are specific settings or restrictions in the operating system that could be limiting the use of RAM.
If you're experiencing slowness or other issues despite having available RAM, it might be helpful to investigate further. Consider monitoring RAM usage over time using tools like Task Manager in Windows or Activity Monitor in macOS to get a better understanding of how memory is being utilized.