This bundle includes two Hynix DDR3 SDRAM modules, each with a capacity of 4GB and a total of 8GB. The memory features ECC memory technology and has a bus speed of PC3-12800 (DDR3-1600). The modules are compatible with computers that have a DIMM form factor and 240 pins. This product is ideal for those who want to upgrade their computer's memory without compromising on quality.