HMAA8GR7CJR4N-RD - 64GB DDR4-3200 ECC RDIMM | SK hynix
料号： HMAA8GR7CJR4N-RD ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $189 | $189.00 |
| 10 | $182 | $1,820.00 |
| 100 | $174 | $17,400.00 |
| 500 | $168 | $84,000.00 |
| 1,000 | $162 | $162,000.00 |
HMAA8GR7CJR4N-RD 概述
A registered DIMM (RDIMM) is a server-class memory module that buffers the command and address signals through a register IC before they reach the DRAM chips, reducing electrical loading on the memory controller and enabling higher module counts per channel than unbuffered UDIMMs. Within the memory hierarchy, RDIMMs belong to the DDR4 SDRAM family, itself part of the broader volatile dynamic random access memory (DRAM) category used in servers, workstations, and data-center platforms. Error-correcting code (ECC) adds extra check bits (x4/x72 organization) so single-bit memory errors can be detected and corrected in flight, which is essential for uptime-critical computing.
Key features of the HMAA8GR7CJR4N family include 64GB capacity organized as 8Gx72, dual rank (2Rx4) with 36 4Gb x4 Flipchip SDP DDR4 components, 3200 Mbps transfer rate (PC4-25600), and 1.2V operation for reduced power compared with DDR3. The -RD suffix in this MPN denotes the module speed-temperature grade configuration of the 16Gb C-die based RDIMM family (HMAA8GR7CJR4N / HMAA4GR7CJR8N / HMAA4GR7CJR4N), per the SK hynix 16Gb C-die RDIMM datasheet.
Architecturally, the module uses 16Gb C-die (CJR) DDR4 components mounted on a 288-pin registered ECC DIMM PCB with a register and SPD hub. The x4 DRAM device width, combined with ECC, enables Chipkill-class reliability when paired with server memory controllers. CL22 timing at 3200 MT/s provides a first-word latency of approximately 13.75 ns, balancing bandwidth and latency for virtualization workloads.
Typical applications include enterprise servers (Dell PowerEdge, HPE ProLiant, Lenovo ThinkSystem), virtualization hosts, and data-center compute nodes that require high-density, ECC-protected memory at DDR4-3200 speeds.
Design consideration: verify that your server platform supports DDR4-3200 RDIMMs and populate memory channels symmetrically (same module type per channel) to maximize bandwidth; mixing module grades can force derating to lower speeds.
This page synthesizes distributor stock data, drop-in alternatives, and practical deployment notes not found in the manufacturer datasheet.
直接替换替代料： HMAA8GR7CJR4N-RD ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： HMAA8GR7CJR4N-RD （相同外形与封装尺寸） ——差异在于 ECC, Module Type, Organization.
快速对比工具——选择替代料号进行并排对比：
HMAA8GR7CJR4N-XN
✅ 直接替换📋 参考替代料（不在目录中）
HMAA8GR7CJR4N-XNTG
✅ 直接替换📋 参考替代料（不在目录中）
HMAA8GR7CJR4N-XNT4
✅ 直接替换📋 参考替代料（不在目录中）
HMAA8GR7CJR4N-XNB8
✅ 直接替换📋 参考替代料（不在目录中）
HMAA8GR7CJR4N-WMT4
✅ 直接替换📋 参考替代料（不在目录中）
NEMIX RAM 64GB DDR4-3200 PC4-25600 2Rx4 ECC RDIMM
✅ 直接替换📋 参考替代料（不在目录中）
HMAA8GR7CJR4N-RD 规格参数
| 存储器类型 | DDR4 SDRAM |
| Module Type | 288-Pin RDIMM (Registered DIMM with ECC) |
| Capacity | 64 GB |
| 存储组织 | 8G x 72 (8Gx72) |
| Rank | Dual Rank (2Rx4) |
| Transfer Rate | 3200 Mbps / MT/s (PC4-25600) |
| CAS 延迟 | CL22 |
| Operating Voltage | 1.2 V |
| DRAM Organization | 36 x 4Gb x4 Flipchip SDP DDR4 components (16Gb C-die based) |
| 引脚数量 | 288 |
| ECC | Yes (Registered ECC) |
| Standards Compliance | 100% JEDEC compliant |
| RoHS 状态 | Compliant |
| Lead Free | Yes |
| REACH SVHC | No SVHC |
| Radiation Hardening | No |
| Platform Compatibility | Server platforms (Dell, HPE, Lenovo, Supermicro) |
HMAA8GR7CJR4N-RD standard 引脚配置指南
HMAA8GR7CJR4N-RD（standard 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： HMAA8GR7CJR4N-RD.
请参阅 数据手册 以查看完整引脚配置。
典型应用
HMAA8GR7CJR4N-RD 适用于 6 应用s: Enterprise Servers, Virtualization Hosts, Data Center Compute Nodes, Memory-Intensive Databases, Server Memory Upgrades and Spares, Workstations and GPU Compute Servers.
Enterprise Servers
Enterprise server platforms such as Dell PowerEdge, HPE ProLiant, and Lenovo ThinkSystem are the primary target for the HMAA8GR7CJR4N-RD. The 64GB capacity per 288-pin slot maximizes memory density without occupying every channel, and the registered interface buffers command/address lines so the memory controller can drive higher module counts with stable signaling at 3200 MT/s. The x4 DRAM device width plus ECC provides Chipkill-class error correction on supporting platforms, which is essential for uptime-sensitive deployments. Populate channels symmetrically with identical modules to achieve full PC4-25600 bandwidth; verify the server vendor's qualified memory list includes the -RD grade before mixing with other suffixes.
推荐
Virtualization Hosts
Virtualization hosts running VMware ESXi, Hyper-V, or KVM benefit directly from the HMAA8GR7CJR4N-RD's 64GB-per-DIMM density: fitting more VMs per server reduces rack space and power per workload. The module's 3200 MT/s bandwidth (PC4-25600) with CL22 timing (about 13.75 ns first-word latency) sustains the memory-intensive random access patterns typical of consolidated VMs, while ECC corrects single-bit errors that would otherwise crash hypervisors. Deploying eight of these modules in an eight-channel server yields 512GB per socket with full-bandwidth interleaving; using 64GB modules instead of 32GB frees remaining slots for future growth without downtime.
推荐
Data Center Compute Nodes
High-density data-center compute nodes use the HMAA8GR7CJR4N-RD to hit large memory footprints per rack unit. With 16Gb C-die DRAM technology at 1.2V, the module balances power draw against throughput: at 3200 MT/s, each module delivers about 25.6 GB/s of theoretical peak bandwidth per 64-bit channel. Registered ECC DIMMs are mandatory in most two-socket servers, and the 2Rx4 organization keeps electrical loading within JEDEC limits for two DIMMs per channel. Distributor stock data (about 20,000+ units of family variants as of mid-2026) supports volume rollouts and spare-pool standardization across fleets.
推荐
Memory-Intensive Databases
In-memory databases such as SAP HANA, Redis, and MemSQL scale with installed DRAM capacity, making the 64GB HMAA8GR7CJR4N-RD a cost-effective building block for multi-terabyte configurations. ECC protection is non-negotiable for transactional databases, since an uncorrected bit flip can corrupt indexes or commit logs; the x4 devices in this module enable stronger (Chipkill-class) correction than x8-based modules on supporting platforms. The 3200 MT/s rate feeds large buffer pools efficiently, while dual-rank interleaving improves effective bandwidth over single-rank alternatives in sequential scan workloads.
推荐
Server Memory Upgrades and Spares
The HMAA8GR7CJR4N-RD and its slot-compatible siblings (HMAA8GR7CJR4N-XN, -XNTG, -XNT4, -XNB8, -WMT4) are widely used for field upgrades and spare-pool stocking because the family shares one physical and electrical footprint: 64GB, DDR4-3200, ECC RDIMM, 2Rx4, 1.2V, 288-pin. Third-party certified-compatible modules such as NEMIX RAM 64GB DDR4-3200 2Rx4 ECC RDIMM offer additional supply resilience when Hynix stock is constrained. Standardizing spares on one capacity/speed class simplifies RMAs and avoids the derating penalties of mixing speeds, keeping fleet memory performance uniform after repairs.
推荐
Workstations and GPU Compute Servers
GPU compute servers and high-end workstations used for AI training data pipelines, rendering, and simulation require large host memory to stage datasets for accelerator cards. The HMAA8GR7CJR4N-RD provides 64GB per DIMM at DDR4-3200, letting a dual-socket platform reach 1TB or more of ECC-protected host memory. The registered interface and CL22 timing deliver stable bandwidth under sustained loads, and the 1.2V operation keeps thermal output within typical server airflow budgets. Confirm the workstation or GPU server platform lists 2Rx4 DDR4-3200 RDIMMs as supported, since some workstation boards accept only UDIMMs.
推荐
推荐产品汇总
工程参考数据： HMAA8GR7CJR4N-RD ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | HMAA8GR7CJR4N-XN | HMAA8GR7CJR4N-XNTG | HMAA8GR7CJR4N-XNB8 | NEMIX RAM 64GB DDR4-3200 RDIMM |
|---|---|---|---|---|---|
| Package | 288-Pin RDIMM | 288-Pin RDIMM - same | 288-Pin RDIMM - same | 288-Pin RDIMM - same | 288-Pin RDIMM - same |
| Brand | SK hynix | SK hynix | SK hynix | SK hynix | NEMIX RAM |
| Capacity | 64 GB | 64 GB | 64 GB | 64 GB | 64 GB |
| Speed | 3200 MT/s (PC4-25600) | 3200 MT/s (PC4-25600) | 3200 MT/s (PC4-25600) | 3200 MT/s (PC4-25600) | 3200 MT/s (PC4-25600) |
| Operating Voltage | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V |
| ECC / Registration | ECC Registered (RDIMM) | ECC Registered | ECC Registered | ECC Registered (RDIMM) | ECC Registered |
关键差异点
- Maximum density per slot at DDR4-3200 （对比 HMA84GR7CJR4N-RD)
- Chipkill-class reliability via x4 devices （对比 NEMIX RAM 64GB DDR4-3200 RDIMM (x8-based variants))
- Fleet-compatible drop-in family （对比 HMAA8GR7CJR4N-XN)
设计说明
Never mix speed grades within a channel. Most server memory controllers train to the slowest installed module, so pairing HMAA8GR7CJR4N-RD (DDR4-3200) with DDR4-2666 RDIMMs derates the entire channel to 2666 MT/s, cutting theoretical bandwidth from about 25.6 GB/s to 21.3 GB/s per channel. Also, DDR4 modules are keyed differently from DDR3 and cannot be inserted into DDR3 slots. Always verify the platform qualified memory list (QVL) accepts the exact -RD suffix before deployment.
The module operates at 1.2V; a fully populated server with 24 of these 64GB RDIMMs draws significant standby and active power from the memory rails. Estimated: DDR4 RDIMM power at 3200 MT/s is roughly 4-7 W per module under load (estimate based on JEDEC-class DDR4 power models, not a datasheet figure), so 24 modules can add 100-170 W to server thermal load. Ensure PSU headroom and chassis airflow account for this when planning dense configurations.
RDIMMs use a register to buffer command/address signals precisely because raw DRAM loading would violate signal-integrity margins at high module counts. Do not substitute this registered module with an unbuffered UDIMM of the same capacity: most server platforms reject mixed registered/unbuffered populations, and load-reduction benefits are lost. For two DIMMs per channel configurations, keep the dual-rank 2Rx4 organization consistent across channels to maintain training margins at 3200 MT/s.
合规信息
Per icDirectory specification data for HMAA8GR7CJR4N-WMT4: RoHS Compliant, Lead Free, REACH SVHC: No SVHC, Radiation Hardening: No. Halogen-free and conflict-minerals status not stated in provided data.
