Increase installed server memory capacity with a 128 GB DDR5-6400 ECC registered DIMM built for compatible Supermicro platforms. Registered DIMM architecture supports server memory configurations that require RDIMM modules rather than unbuffered desktop memory. ECC functionality helps detect and correct memory errors, an important requirement for systems running virtual machines, databases, analytics workloads, and other continuously operating services. The ACCORTEC MEM-DR512PC-ER64-ACC uses a 2Rx4 organization. Its 128 GB capacity lets an administrator add substantial memory capacity per populated slot where the host platform supports this module density. DDR5-6400 speed identifies the module as a high-bandwidth DDR5 server-memory option for platforms validated for that memory rate. Confirm that the target server supports DDR5 ECC RDIMMs, 128 GB module capacity, and the intended population arrangement before installation. This module is specifically positioned as Supermicro-compatible memory rather than general-purpose client RAM. The combination of registered operation, ECC capability, 2Rx4 organization, 128 GB capacity, and DDR5-6400 speed distinguishes it for dense server-memory upgrades. Use matched module characteristics across a memory channel when maintaining balanced capacity and performance in multi-channel server configurations.