HMA84GR7CJR4N-VK Hynix 32GB PC4-21300 SDRAM Memory

Hynix 32GB Memory PC4-21300 Memory

Capacity: 32GB

The "32GB" designation indicates a high-density module, allowing for substantial total system memory without occupying excessive DIMM slots. This is crucial for virtualization, large in-memory databases (like SAP HANA), and data-intensive applications. The "PC4-21300" and "2666Mhz" refer to its data transfer rate. PC4-21300 denotes a peak transfer rate of approximately 21,300 MB/s. The 2666Mhz (more accurately 2666 MT/s, or Mega transfers per second) is the clock speed at which the module operates, balancing high bandwidth with compatible system support across Intel Xeon Scalable and AMD EPYC platforms.

ECC and Registered Design

ECC is a non-negotiable feature for data integrity. It works by adding extra bits (in this case, a standard 8-bit ECC for a 64-bit word) to stored data. The memory controller uses these bits to detect and correct single-bit errors on-the-fly and detect (but not correct) multi-bit errors. This silent correction prevents silent data corruption (SDC), where erroneous data propagates through the system unnoticed, potentially leading to corrupted calculations, databases, or rendered files. For financial modeling, scientific research, and archival storage, ECC is indispensable.

Thermal Management

Stability

The "Registered" or "RDIMM" aspect is distinct from ECC (though often combined). The register acts as a traffic controller between the memory controller and the DRAM chips. It buffers the command and address signals, reducing the electrical load on the controller. This allows a server motherboard to populate all its memory channels with dual-rank or quad-rank modules like this Hynix one without overloading the memory subsystem. The result is enhanced signal integrity, greater stability at high speeds with high module counts, and support for maximum memory capacities.

Form Factor and Voltage: The 288-Pin DIMM

This module conforms to the standard DDR4 288-pin DIMM form factor, operating at a nominal voltage of 1.2V. This lower voltage (compared to DDR3's 1.5V) reduces power consumption and heat generation—a critical factor when multiplying by dozens or hundreds of modules in a data center rack, leading to significant power savings and cooling efficiency.

Enterprise Servers and Data Centers

This is the core application. The module is a perfect fit for mainstream 1U/2U rack servers and larger multi-node systems from vendors like Dell (PowerEdge), HPE (ProLiant), Lenovo (Think System), Cisco (UCS), and Super micro. It is designed to be used in multi-channel configurations (e.g., in sets of 4, 6, 8, 12, or more) to fully leverage the memory bandwidth of modern server platforms.

Virtualization Hosts (VMware, Hyper-V, KVM)

Virtualization consolidates multiple virtual machines (VMs) onto a single physical host. Each VM requires allocated RAM. High-density, reliable RDIMMs like the 32GB Hynix module allow administrators to maximize VM density per host, improving hardware utilization and efficiency while ensuring isolation and stability between workloads.

ECC RDIMM vs. Non-ECC UDIMM

Non-ECC Unbuffered DIMMs are for desktops and low-end workstations. They lack both error correction and a register. They are cheaper and have slightly lower latency but are limited in capacity per module and total system support. They are unsuitable for servers due to capacity limits, lack of data integrity features, and instability in multi-DIMM configurations.

ECC RDIMM vs. LRDIMM (Load Reduced DIMM)

LRDIMMs use a memory buffer (not just a register) to further reduce electrical load, enabling the highest possible capacities and module counts. They are more expensive and have slightly higher latency than RDIMMs. The Hynix 32GB RDIMM offers an optimal balance of cost, capacity, and performance for the majority of enterprise applications, while LRDIMMs target maximum capacity above all else (e.g., 128GB+ per module).

Reliability

Modules like the HMA84GR7CJR4N-VK are built with higher-grade components and undergo more rigorous testing than consumer modules. They are often backed by a lifetime or a lengthy advanced replacement warranty, reflecting their intended use in 24/7/365 operation. This long-term reliability and support are intrinsic parts of the product category's value proposition.

Operating System Monitoring for ECC Events

In Linux, tools like can report corrected ECC errors logged by the memory controller. In Windows Server, these events are typically logged in the System Event Log. Monitoring for a sudden increase in corrected errors can be an early warning sign of a failing module or marginal system conditions, allowing for proactive replacement before uncorrected errors occur.

Compatibility

When upgrading or building a computer system, it's important to consider the compatibility of the memory modules with other components. The CL19 specification is a commonly supported latency setting, ensuring wide compatibility with different motherboards and processors. Compatibility is crucial to ensure smooth system operation and avoid any potential issues that may arise from incompatible components.