It's important to keep track of the number of resources you're using on your Dedicated server to avoid hitting any limits. There is a page in the panel that allows you to see user statistics:
Scroll down to the Other Active Services section and click the link.
Checking RAM usage in real-time
The panel doesn't show RAM usage for your Dedicated server. To view this information, you need to log into your server via SSH and run commands to check this information. View the following link for examples. Please note that even though the article is referencing a VPS machine, you can still use those commands on your Dedicated server.