I have a Dell inspiron 5720 intel core i5-3210m 3rd gen with 6gb sodimm ram 1600 mHz. I want to upgrade to 16gb ram and I am not sure what is the best bang for my buck and what is best compatible. I am considering the corsair vengeance pc12300 1600, or the g.skill ripjaws dual channel 1866 mHz. Which is the best for my system? Are both/either compatible? I am not a complete noob but I am no computer wizard either. Please help. Any input is greatly appreciated. Thank you in advance.