Well, just my opinion.
3G Ram for laptop is a lot ( relative term, I knew people using 16G to 32G RAM for modern laptop).
Unless you are running RAM intensive programs, video editing, photo editing etc, you should be doing well in Linux with just 2G RAM. Anyway using laptop for those tasks is also not too good due to much lower resolution of display compared with desktop with a very large LCD display with high resolution.
If I open two browsers firefox / palemoon, and each 20-30 tabs, running a youtube video, do some browsing, download some files via internet, the RAM used is still less than around 800M to 1.1G
Even running Win7 would take just 1.2-1.8G Ram for such a loading..
If I were in this situation I would not add any more RAM.