General

Engineer's Note

Designed as a 64GB DDR4-2933 Registered RDIMM with ECC, this module is purpose-built for server platforms handling memory-intensive workloads such as virtualization, in-memory databases, and data analytics. Its Quad Rank x4 configuration maximizes density per channel while the registered signal enhances signal integrity under heavy load, ensuring reliable data integrity and system stability in multi-DIMM deployments.

Technical Specs & Insights

1. Registered signal type provides a buffered command/address bus, enabling the deployment of massive memory populations without compromising signal integrity in large-scale server nodes.
2. ECC protection silently corrects single-bit errors, a non-negotiable safeguard for financial transactions and in-memory databases where data corruption is unacceptable.
3. High-capacity module design maximizes memory per channel, allowing virtualization hosts to run significantly more VMs before reaching memory limits.
4. Quad Rank x4 organization packs more DRAM packages per module, keeping high-density server slots fully populated for balanced memory bandwidth under multi-socket workloads.
5. 2933 MT/s throughput accelerates in-memory analytics and caching layers, delivering lower latency for real-time decision-making in enterprise environments.

Why These Specs Matter

Designed as a 64GB DDR4-2933 Registered DIMM with ECC, the M386A8K40CM2-CVFBY is engineered for servers where uptime and data integrity are non-negotiable. Its four key characteristics address the real-world pain points of demanding enterprise environments. First, the ECC technology silently corrects single-bit memory errors before they corrupt transactions. In an in-memory database like SAP HANA, a flipped bit in a financial ledger isn’t just a glitch—it’s a compliance risk, and ECC turns that risk into a non-event. Second, the registered signal buffer allows the memory controller to drive this dense Quad Rank x4 module cleanly across a fully populated server. For a VMware or Hyper-V virtualization cluster running dozens of VMs, that means you can confidently fill all 24 DIMM slots without signal degradation, avoiding mysterious kernel panics during peak load. Third, the Quad Rank x4 architecture packs massive 64GB capacity per stick, letting a dual-socket server reach 1.5TB or more of RAM. This is critical for consolidating multiple live VM migrations onto fewer hosts, directly reducing licensing and operational costs. Finally, the DDR4-2933 speed at 1.2V delivers a balanced 23.4 GB/s bandwidth per channel without excessive heat. When hundreds of concurrent users hit a database engine, that extra throughput keeps query response times flat, translating into tangible productivity gains.

Endurance & Reliability

General Virtualization
For general virtualization hosts, populate all memory channels symmetrically with these 64 GB quad-rank RDIMMs to maximize bandwidth and consistency. A dual-socket server with 12 or 16 modules (768 GB–1 TB) comfortably handles high VM density, while using identical parts ensures stable NUMA balancing and avoids performance cliffs under load.

In-Memory Database
In-memory databases demand maximum capacity and reliable data integrity. Fully load all DIMM slots with these 64 GB ECC RDIMMs—24 slots yield 1.5 TB—to hold entire datasets in RAM. Install modules in balanced sets per memory controller and enable interleaving; although quad-rank parts may limit speed to 2666 MT/s with two DIMMs per channel, the sheer capacity often outweighs the slight frequency trade-off.

High-Performance Computing
HPC workloads are exquisitely sensitive to memory bandwidth. To sustain the full 2933 MT/s speed, deploy just one quad-rank 64 GB module per channel (e.g., eight modules on an eight-channel platform for 512 GB). Reserve multi-DIMM-per-channel configurations only when capacity absolutely dominates, and validate application performance thoroughly, as the resulting speed drop to 2400 MT/s can throttle floating-point throughput.

Verified Compatibility

Rigorously validated for servers; compatible with Dell PowerEdge R760, HPE ProLiant DL380 Gen11, Lenovo ThinkSystem SR650 V3.

FAQ