The A-Tech 128GB KIT (2x64GB) DDR4 2666MHz PC4-21300 4DRx4 (4Rx4) 1.2V LRDIMM is a high-quality memory module that provides 128GB of total capacity with 64GB per module. It features a low power consumption of 1.2V and a bus speed of PC4-21300 (DDR4-2666). This DDR4 SDRAM module is designed for use in computers and servers that require ECC memory support. With a lifetime manufacturer warranty and a form factor of LRDIMM, this memory module is a reliable and efficient choice for improving the performance of your system.