For sale are 8GB modules of Samsung DDR4-2666 / PC4-21300 SO-DIMM laptop memory. Part number = M471A1K43CB1-CTD Clock speed = 2666MHz Voltage = 1.2V Used but in good condition and have been tested prior to going on eBay by booting a laptop into Windows and running a test loop of TechPowerUp's "MemTest64". Posted with Royal Mail large letter (options available). I am a private seller. Thanks!