These two modules of 2GB DDR3-1333 DIMM from Samsung (Picture shows front and back of one module) is a great choice for anyone looking to upgrade their computer's memory capacity. With a total of 18 modules and a bus speed of PC3-10600 (DDR3-1333), this DDR3 SDRAM provides reliable and fast performance. The form factor is a standard DIMM and the type is DDR3 SDRAM, making it compatible with a wide range of computer models. The Samsung brand ensures high quality and durability, making it a reliable choice for your memory needs. Picture shows front and back of the module. Free USPS shipping.