Samsung 4GB DDR3 desktop RAM module (model M378B5173DB0-CK0) rated at 1600 MHz (PC3-12800U), featuring a 240-pin DIMM layout, single-rank organization (1Rx8), and manufactured in Korea. Key Specifications - Capacity: 4 GB, Memory Type: DDR3 SDRAM, Speed/Bus: 1600 MHz (PC3-12800), Form Factor: 240-pin DIMM (Desktop)