Secure payments
Standard refund policy
Trade Assurance
| Compliance Standards | EU RoHS,FCC |
|---|---|
| Product Type | Memory Module |
| Memory Capacity | 256 GB |
| Memory Technology | DDR4 |
| Product Voltage | 1.2 V |
| RAM Speed | 2933 MHz |
| RAM Standard | DDR4-2933/PC4-23400 |
| Error Identifying | ECC |
| Signal Type | Registered |
| Column Access Strobe (CAS) | CL21 |
| Rank | Octal Rank x4 |
| Quantity of Pins | 288-pin |
| RAM Genre | RDIMM |
This 256GB DDR4-2933 Registered ECC RDIMM is engineered for enterprise servers and memory-intensive workloads such as virtualization and in-memory databases, where its octal-rank x4 configuration maximizes capacity density while Registered signal routing and ECC error correction ensure data integrity under heavy load. The CL21 CAS latency balances access speed with the stability demanded by large-rank designs, making it an optimal choice for platforms that require both high-capacity scaling and mission-critical reliability.
1. The enormous 256GB capacity per module allows data-center servers to host more virtual machines and large in-memory databases without sacrificing DIMM slot availability.
2. ECC protection silently corrects single-bit errors and detects multi-bit faults, preserving data integrity critical for financial transactions and long-running analytic workloads.
3. The registered signal type buffers command and address lines, enabling the stable population of numerous modules per channel in dense rack servers where signal integrity is paramount.
4. Octal Rank x4 organization packs eight independent ranks on a single stick, maximizing memory channel utilization and consistent throughput under heavy virtualization consolidation.
5. DDR4-2933 speed delivers the high sustainable bandwidth required to feed multi-core server CPUs, reducing data-starved cycles in real-time big data processing tasks.
The M393ABG40M5B-CYF is a 256GB DDR4-2933 registered ECC DIMM purpose-built for enterprise servers, where stability and data integrity are non-negotiable. Its ECC continuously corrects single-bit errors and detects multi-bit failures, effectively eliminating the silent data corruption that can crash virtual machines or poison transactional databases — for a busy virtualization cluster hosting dozens of tenants, this means you avoid unexplained service outages and safeguard business continuity. The registered buffering stabilizes address and command signals across heavily loaded memory channels, allowing you to fully populate 24‑slot servers without the signal degradation that would cause intermittent faults; in practice, this lets you confidently pack more virtual machines or larger database caches onto a single node. The module’s octal‑rank x4 design further enables enormous capacity on one stick while increasing bank‑level parallelism — for an in‑memory analytics engine like SAP HANA, the memory controller can interleave requests across more banks, lowering latency spikes and keeping query performance high even under concurrent user loads. With 256GB per module, you reach multi‑terabyte footprints with fewer DIMMs, reducing both power draw and bill‑of‑materials, which directly lowers total cost of ownership and leaves room for future expansion.
Capacity Planning for 256GB DDR4-2933 Registered ECC RDIMMs
This module’s 256GB density, octal-rank x4 organization, and registered ECC design make it exclusively suited for enterprise servers. Capacity planning must balance memory bandwidth, channel population, and fault tolerance for each workload.
General Virtualization
Deploy one DIMM per populated memory channel to maximize total capacity while retaining reasonable bandwidth. For a dual-socket server with 16 channels, installing four to six of these modules yields 1–1.5 TB, comfortably hosting 100+ light-to-medium VMs. Always leave headroom for hypervisor overhead and live-migration failover; avoid exceeding 80% physical memory utilization.
In-Memory Database
Populate all memory channels symmetrically with one 256GB DIMM each to reach 4 TB on a high-core-count system, ensuring the entire dataset fits in DRAM. Opt for 2 DIMMs per channel only if absolute capacity outweighs the slight latency penalty, as octal-rank loading can reduce command rate. Enable memory interleaving and lock critical NUMA nodes to minimize remote access latency for time-sensitive transactions.
High-Performance Computing
Prioritize bandwidth over maximum capacity: install one DIMM per channel across all available channels to sustain peak throughput per core. For 8-channel platforms, 8×256GB delivers 2 TB at full speed, ideal for large-scale simulations. Use ECC scrubbing and patrol functions to prevent silent data corruption during multi-day runs, and configure memory sparing if node uptime cannot tolerate uncorrected errors.
Proven compatible with Dell PowerEdge R750, HPE ProLiant DL380 Gen10, Lenovo ThinkSystem SR650; rigorously tested server memory.
Q: Can I mix this M393ABG40M5B-CYF with other memory modules of different brands or speeds?
A: Mixing RDIMMs of different brands or speeds is not recommended. Mismatched ranks or timings can cause system instability and POST failures on server platforms. Always use identical modules for guaranteed compatibility.
Q: Is this memory compatible with my system?
A: This DDR4-2933 Registered ECC module is designed for Intel Xeon Scalable and AMD EPYC platforms. Please verify that your server board supports 256GB Octal Rank x4 RDIMMs and check the vendor’s qualified vendor list.
Q: What is the recommended DIMM population order for optimal performance?
A: Populate identical modules in symmetrical slots per memory channel as specified by your server manual. For these octal-rank RDIMMs, balance channels across all CPU sockets to maximize bandwidth and avoid thermal throttling.
Q: Does this module support overclocking or XMP profiles?
A: No, enterprise RDIMMs strictly adhere to JEDEC DDR4-2933 specifications (PC4-23400, CL21). They do not support XMP or overclocking, as reliability and ECC integrity are prioritized over speed adjustments.
Q: What warranty and typical failure rate can I expect?
A: This module is covered by a one-year warranty. In enterprise environments, ECC RDIMMs typically exhibit an annualized failure rate well under 0.5%, reflecting stringent qualification and testing standards.