The four each-32GB PC4-21300 RDIMM replacement for Supermicro MEM-DR432L-CL03-ER26 memory RAM is a high-quality memory module designed for servers and other high-performance computing needs. This DDR4 SDRAM module has a total capacity of 128GB spread across 4 modules, with each module offering 32GB of ECC registered memory. With a frequency of 2666MHz and a bus speed of PC4-21300, this memory module provides fast and reliable performance.