Actually you can upgrade a lot more. It just depends on how many risks you are going to take. If you want to replace any components on the motherboard you will have to replace the whole motherboard. Other than that you can get new fans, new screen, replace the shell, wifi antenna - and a lot more. But beware: replacing anything other than RAM and the disks is quite difficult and can (often) require great knowledge of the components you are working with, something not for the common user. I have no idea how experienced you are.