General

Engineer's Note

This 64GB DDR4-3200 RDIMM is engineered for enterprise server platforms, delivering registered signal integrity and ECC protection to ensure mission-critical data integrity in virtualized environments and in-memory database workloads. Its dual-rank x4 organization with CAS 22 latency provides a balanced trade-off between high-density memory scalability and responsive access, making it ideal for heavily threaded, memory-intensive applications.

Technical Specs & Insights

1. The 64GB capacity per module maximizes memory density in servers, allowing far more virtual machines to run concurrently on a single node without resorting to costly scale-out architectures.
2. DDR4-3200 speed delivers up to 25.6 GB/s of peak bandwidth, dramatically accelerating in-memory databases and real-time analytics workloads that stall on slower ranks.
3. ECC error correction detects and corrects single-bit flips in real time, preserving data integrity in financial transactions and scientific computations where silent corruption is unacceptable.
4. Registered signal buffering stabilizes electrical loads across heavy DIMM populations, ensuring 24/7 operational reliability even when all memory channels are fully populated.
5. Dual Rank x4 organization interleaves accesses to keep server memory controllers saturated, slashing latency under the intense parallel request streams of dense virtualization hosts.

Why These Specs Matter

The M393A8G40BB4-CWE is a registered DDR4-3200 ECC RDIMM designed for enterprise servers where reliability defines your SLA. In a virtualization cluster, its registered clock driver buffers command signals, enabling stable operation with fully populated memory channels—this means higher VM density and seamless live migrations without performance hits. Integrated ECC silently corrects single-bit errors before they corrupt critical data, shielding hypervisors and financial databases from unexplained crashes and integrity issues. For in-memory databases like SAP HANA or Redis, the 64GB capacity and dual-rank x4 organization work together: dual rank interleaving hides row activation latency, boosting effective bandwidth so thousands of concurrent queries complete faster. Running at 3200 MT/s with CL22 and a low 1.2V, it delivers the throughput needed for real-time analytics while reducing energy costs per gigabyte. This module is the assurance that your data stays accurate, services remain up, and infrastructure scales confidently.

Endurance & Reliability

This is a 64GB DDR4-3200 ECC Registered RDIMM intended for server platforms. Use the capacity planning guidance below for typical workloads.

General Virtualization
Populate one DIMM per channel (1DPC) to retain the full 3200 MT/s speed. In a dual-socket server with eight memory channels each, deploy eight 64GB modules per CPU for 512 GB per socket. This configuration provides enough capacity for dense VM consolidation without memory bandwidth bottlenecks.

In-Memory Database
Maximize total capacity by filling all available DIMM slots—12 or 16 modules achieve 768 GB to 1 TB. The dual-rank x4 design enhances bank interleaving, lowering latency for high-throughput transactional workloads. Always align memory population with NUMA boundaries to keep data local to each processor.

HPC
Bandwidth is paramount. Install a single 64GB DIMM per channel for 512 GB per socket at 3200 MT/s. For simulations with larger working sets, move to two DIMMs per channel (2DPC), delivering up to 1 TB per socket while accepting a slight speed reduction to 2933 MT/s. Ensure memory bandwidth per core is sufficient to prevent compute stalls.

Verified Compatibility

Rigorously tested server memory, compatible with Dell PowerEdge R750, HPE DL380 Gen10 Plus, Lenovo SR650 V2.

FAQ