HMAA8GR7CJR4N-RD - 64GB DDR4-3200 ECC RDIMM | SK hynix
MPN: HMAA8GR7CJR4N-RD β Active| Qty | Unit Price | Extended |
|---|---|---|
| 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 |
Drop-in alternatives for HMAA8GR7CJR4N-RD β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
HMAA8GR7CJR4N-XN
β Drop-Inπ Reference alternative (not in catalog)
HMAA8GR7CJR4N-XNTG
β Drop-Inπ Reference alternative (not in catalog)
HMAA8GR7CJR4N-XNT4
β Drop-Inπ Reference alternative (not in catalog)
HMAA8GR7CJR4N-XNB8
β Drop-Inπ Reference alternative (not in catalog)
HMAA8GR7CJR4N-WMT4
β Drop-Inπ Reference alternative (not in catalog)
NEMIX RAM 64GB DDR4-3200 PC4-25600 2Rx4 ECC RDIMM
β Drop-Inπ Reference alternative (not in catalog)
HMAA8GR7CJR4N-RD Maximum Ratings & Electrical Characteristics
| Memory Type | DDR4 SDRAM |
| Module Type | 288-Pin RDIMM (Registered DIMM with ECC) |
| Capacity | 64 GB |
| Organization | 8G x 72 (8Gx72) |
| Rank | Dual Rank (2Rx4) |
| Transfer Rate | 3200 Mbps / MT/s (PC4-25600) |
| CAS Latency | CL22 |
| Operating Voltage | 1.2 V |
| DRAM Organization | 36 x 4Gb x4 Flipchip SDP DDR4 components (16Gb C-die based) |
| Pin Count | 288 |
| ECC | Yes (Registered ECC) |
| Standards Compliance | 100% JEDEC compliant |
| RoHS Status | Compliant |
| Lead Free | Yes |
| REACH SVHC | No SVHC |
| Radiation Hardening | No |
| Platform Compatibility | Server platforms (Dell, HPE, Lenovo, Supermicro) |
HMAA8GR7CJR4N-RD standard Pin Configuration Guide
Complete pinout information for HMAA8GR7CJR4N-RD (standard package) with 288 pins. This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for HMAA8GR7CJR4N-RD.
Refer to the datasheet for full pin configuration.
Estimated pin count: 288 pins (digital package)
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
HMAA8GR7CJR4N-RD is suitable for 6 applications: 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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
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.
Recommended
Recommended Products Summary
Engineering reference data for HMAA8GR7CJR4N-RD β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 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) |
| CAS Latency | CL22 | CL22 | [DATA_NEEDED] | [DATA_NEEDED] | CL22 |
| Rank / Organization | 2Rx4 (8Gx72) | 2Rx4, Dual Rank | 2Rx4 (8Gx72) | [DATA_NEEDED] | 2Rx4 |
| 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 |
| Compliance | JEDEC compliant, RoHS, Lead Free | JEDEC compliant | JEDEC compliant | [DATA_NEEDED] | JEDEC compatible |
Key Differentiators
- Maximum density per slot at DDR4-3200 (vs HMA84GR7CJR4N-RD)
- Chipkill-class reliability via x4 devices (vs NEMIX RAM 64GB DDR4-3200 RDIMM (x8-based variants))
- Fleet-compatible drop-in family (vs HMAA8GR7CJR4N-XN)
Design Notes
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.
Compliance Information
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.
