Hello,
First question, are you running out of RAM? In task manager is 95% or higher of your RAM in use? If you are just looking to make your system snappier, and are running a mechanical hard drive, than an SSD would help way more than excess RAM. On the forum linked below, it seems to indicate the ram is soldered on. But if you could check if you upgrade to an SSD.
Hope this helps,
Christian
http://forums.whirlpool.net.au/archive/2049434