The Samsung 64GB PC4-2666V-R 2S2Rx4 DDR4 ECC REG RDIMM is a high-quality memory module designed for computers and networking devices. Four (4) DIMMs for a total capacity of 256GB and a clock speed of 2666V-R, this RAM provides fast and efficient performance. It features ECC memory, which is error-correcting, ensuring reliability and stability in demanding computing environments. The module is registered and has a form factor of RDIMM, making it compatible with a wide range of systems. With its sturdy construction and advanced features, this Samsung RAM is a dependable choice for enhancing the performance of your computing devices.