Original Samsung RAM 4 GB DDR4 at 2666MHz Original Micron RAM 4 GB DDR3 at 1600MHz Samsung RAM 4 GB DDR3 at 1600MHz (2) Original Micron RAM 2 GB DDR3 at 1600MHz All information is explained in the advertisement photos You can get the information by clicking on the photos above I removed them from the devices while they were working and clean And if there is any defect or issue, God forbid The matters are easy and simple The most important thing is satisfaction between the two parties Selling to the highest bidder