Samsung 4GB DDR4 SO-DIMM Laptop Memory - M471A5244CB0-CTD. Specifications: Brand Samsung; Model M471A5244CB0-CTD; MPN M471A5244CB0CTD; Total capacity 4 GB (1 module, 4 GB per module); Type DDR4 SDRAM; Form factor SO-DIMM (laptop / notebook); Bus speed PC4-21300 (DDR4-2666), 2666 MHz; UPC 0194026735722. SO-DIMM is the laptop and small-form-factor memory format - please confirm your machine takes DDR4 SO-DIMM memory before ordering. Condition: Used. The item has been used previously and may have some signs of cosmetic wear. Please review the photos, which show the actual module you will receive. Ships from Frederick, Maryland. 30-day returns accepted (buyer pays return shipping).