I just looked it up on the website and it's got a maximum memory of 4 gb so that shouldn't be the problem, I don't know what it could be though as I didn't have any problems going from 1 to 2 gbs.
As for why, I've seriously started to get into computers over the last few months and just really enjoy it. So I guess I'm doing it basically because I can lol.
(hide) If you don't want other users to know what you are doing you can change into cloak mode in Settings (paying members only). (pauloaguia) (show all tips)