The Corsair 16GB (2 x 8GB) DIMM DDR3 2133 (PC3 17000) Memory modules are high-quality memory modules designed for desktop computers. With a total capacity of 16GB divided into two 8GB modules, these Corsair modules offer fast and reliable performance. The DDR3 SDRAM technology, along with features such as ECC memory, registered operation, and fully buffered design, ensures smooth and efficient multitasking capabilities. The modules have a bus speed of PC3-17000 (DDR3-2133) and 240 pins for compatibility with a wide range of motherboards.Was running perfectly before being pulled from a working system. As is for 2 module set 16 GB total.