I have 4GB DDR3 RAM installed in my laptop with intel Core i3 processor. Should I add 4GB Extra RAM to it? I'm going for SSD upgrade. That's why,I am thinking that it may tear my SSD performance in future as I see cached RAM is 6.3 GB (2.3 GB more than that of my current RAM). Or, 4GB RAM is enough for me, six months or a year later I can add 4GB RAM extra.
I never play games. So don't recommend in gamers point of view. I use illustrator, Photoshop, Google Chrome, Word, Excel 2013, Thunderbird, Skype at a time with some other small programs. I have reached 4GB RAM only once.
Check this image for RAM use: