If your computer is doing what you need it to do then theres no need to upgrade.
Exactly. Why are you asking us if you need to upgrade? If you need to ask, then you don't need to upgrade. You haven't expressed any disappointment in your current performance or talked about anything you want done better/faster on your computer.
If you do want your other questions answered, we will need your complete system specs. Especially your motherboard. Or if it is an OEM computer then link us to the computer on the manufacturer's website.