SK Hynix 1x 64GB DDR5-6400 RDIMM PC5-51200R Dual Rank x4 Module

Product Overview

The HMCG94AHBRA is a 64 GB DDR5‑6400 ECC RDIMM, dual‑rank ×4, 1.1 V module, tailored for high-throughput and reliability‑critical server environments. Its low-profile design and broad OEM compatibility make it a premium yet practical upgrade choice for 3rd and 4th generation high-end server platforms.

Do check your server motherboard/BIOS compatibility (particularly with high-density RDIMMs), but otherwise this is a robust pick for memory-intensive workloads.

This RAM module also operates at a standard voltage of 1.1V with a CAS Latency of CL52, and is designed to allow you to run more applications simultaneously, switch between them faster, and provide a smoother computing experience.

Compatibility

You can verify the compatibility of this RAM module in a number of ways:

• Use the RamCity Finder to see all guaranteed compatible RAM upgrades for your brand and model system or motherboard
• Search online to see if this product is on the QVL (Qualified Vendor List) for your system or motherboard
• Contact one of our Upgrade Evangelists for an expert opinion

• Use Cases & Compatibility

  • Target Systems: Designed for enterprise-grade servers and workstations. Certified compatible with platforms like Intel Xeon and AMD EPYC (e.g., Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem) .

  • Primary Benefits:

    • High capacity density: Enables large in-system memory with fewer modules.

    • ECC + registered: Ensures data integrity and system stability—ideally suited for critical workloads.

    • x4 chip organization: Common in server memory for balanced performance and cost.