This lot includes four SK Hynix 2GB 1Rx8 PC3-12800U desktop memory modules, totaling 8GB of memory. The modules have a form factor of DIMM and use DDR3 SDRAM technology with a bus speed of Pc3-12800U (Ddr3-1600). The brand is SK Hynix. This memory lot is ideal for upgrading your desktop's memory capacity and improving its performance. With three modules included, you can also have a spare one in case of any future issues. The lot is compatible with various computer components and parts, and is a great addition to your computing setup.