A:AnswerGood question. You will not be able to expand that RAM on this computer because the memory slot is not user accessible.
For more detailed specifications on this PC, please visit the following link: http://www8.hp.com/h20195/v2/GetPDF.aspx/c04929157.pdf
I hope this helps.
A:AnswerGood question. The processor and RAM are the only differences. The 17-g119dx has a more powerful processor. The more powerful processor makes up for the less amount of RAM. I hope this helps!