Samsung 128GB DDR4 2666MHz PC4-21300 ECC RDIMM Memory Module

The Samsung M393AAK40B42-CWD is a 128GB memory module that follows the DDR4 2666 MHz PC4-21300 standard and uses ECC Registered DIMM technology. It is built for servers that need large memory pools and dependable uptime.

The module operates at 1.2 volts through a 288-pin interface. Its octal rank x4 layout spreads the capacity across eight ranks, helping the memory controller maintain signal integrity even when every slot in the chassis is filled. Integrated 8-bit parity detects and corrects single-bit errors on the fly, protecting data during demanding tasks such as virtualization, analytics, or in-memory databases.

A dedicated register sits between the DRAM chips and the memory controller. By buffering clock, command, and control signals, the register reduces electrical load and lets the server sustain its rated speed with stable timings in multi-channel configurations.

IT administrators can use this module to expand capacity in enterprise servers from manufacturers such as Dell, HPE, Lenovo, and Supermicro, as long as the motherboard specifies support for 128GB 8Rx4 DDR4 2666 RDIMM. Typical scenarios include consolidating virtual machines, accelerating large-scale simulations, and giving database servers additional cache headroom. The module is not intended for desktop PCs, laptops, or mixed ECC and non-ECC configurations.

Always confirm compatibility in the server vendor’s qualified list before deployment. Once installed, the Samsung module works silently in the background, adding bandwidth and capacity so critical applications can keep pace with growing workloads.

Highlights:

• 128GB ECC Registered DIMM that meets DDR4 PC4-21300 specifications
• 2666 MHz effective data rate for fast access to large data sets
• 8Rx4 architecture helps maintain stability at high capacity
• 288-pin interface with 1.2 V operating voltage
• Integrated 8-bit parity for automatic error detection and correction
• Register buffers command and control signals to ease load on the memory controller
• Designed exclusively for servers that accept 128GB DDR4 RDIMM modules