https://www.amazon.com/ASUS-X550ZA-15-6-Inch-Laptop/dp/B00YR6BMOQ   It comes with 8 gig DDR3L - there are 2 slots, so if you currently have a single 8, just add 8 - if you currently have two 4 gig then buy two 8 gigs   http://www.crucial.com/usa/en/x550za/CT7283887   Then get rid of the useless optical drive with this:   https://www.amazon.com/X550JX-X550JK-Optical-Enclosure-Replacement/dp/B076KM9ZWN   depending on the BIOS you can install a SSD
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