HMAA8GR7DJR4N-VK - 64GB DDR4-2666 RDIMM 288-Pin | SK hynix
MPN: HMAA8GR7DJR4N-VK ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $145 | $145.00 |
| 10 | $139.2 | $1,392.00 |
| 100 | $132.75 | $13,275.00 |
| 500 | $127.5 | $63,750.00 |
| 1,000 | $122.4 | $122,400.00 |
Drop-in alternatives for HMAA8GR7DJR4N-VK — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
HMAA8GR7AJR4N-VK
✅ Drop-In📋 Reference alternative (not in catalog)
HMAA8GR7CJR4N-XN
✅ Drop-In📋 Reference alternative (not in catalog)
HMAA8GR7CJR4N-RD
✅ Drop-In✓ In Stock
$162 / Unit
View Datasheet →HMAA8GR7AJR4N-WM
✅ Drop-In📋 Reference alternative (not in catalog)
HMA84GR7DJR4N-VK
✅ Drop-In✓ In Stock
$165 / Unit
View Datasheet →HMAA8GR7CJR4N-RD
✅ Drop-In✓ In Stock
$162 / Unit
View Datasheet →HMAA8GR7DJR4N-VK Maximum Ratings & Electrical Characteristics
| Memory Capacity | 64 GB |
| Memory Type | DDR4 SDRAM |
| Module Type | 288-pin Registered DIMM (RDIMM) with ECC |
| Speed | 2666 MT/s (PC4-21300) |
| Operating Voltage | 1.2 V |
| Organization | 2Rx4 (dual rank, x4) |
| DRAM Configuration | 18 x 8Gb-class DDR4 SDRAM, FBGA |
| ECC | Yes |
| Registration | Registered (buffered) address/command/control |
| Pins | 288 |
| Form Factor | DIMM (server, 288-pin, 1.2V notch key) |
| Manufacturer | SK hynix |
HMAA8GR7DJR4N-VK standard Pin Configuration Guide
Complete pinout information for HMAA8GR7DJR4N-VK (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 HMAA8GR7DJR4N-VK.
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
HMAA8GR7DJR4N-VK is suitable for 6 applications: Enterprise Rack Server Main Memory, Virtualization Hosts, In-Memory Databases, Data Center Memory Upgrades, OEM Server Builds, High-Performance Computing Clusters.
Enterprise Rack Server Main Memory
The HMAA8GR7DJR4N-VK is a primary fit for 2-socket enterprise rack servers such as Dell PowerEdge, HPE ProLiant, and Lenovo ThinkSystem platforms that qualify DDR4-2666 RDIMMs. Its 64 GB capacity and registered architecture allow high per-channel population, letting a single server reach 512 GB or more across 8-12 DIMM slots. The 2Rx4 x4 organization enables robust ECC coverage, and the 1.2V rail keeps module power low enough for dense chassis airflow budgets. Performance consideration: in mixed-population systems the whole channel runs at the slowest module speed, so uniform -VK deployment preserves the full 2666 MT/s bus.
Recommended
Virtualization Hosts
Hypervisor hosts benefit directly from the 64 GB capacity of the HMAA8GR7DJR4N-VK, since VM density scales with installed memory per socket. The registered DIMM design supports fully populated channels in server platforms, and the DDR4-2666 bus provides approximately 21.3 GB/s theoretical bandwidth per channel for guest workloads. ECC protects against multi-tenant memory errors that would otherwise corrupt neighboring VMs. Design note: pairing dual-rank modules like this one improves memory interleaving, typically yielding better throughput than single-rank equivalents in consolidation workloads, at the cost of slightly more restrictive population rules on some platforms.
Recommended
In-Memory Databases
In-memory database workloads (SAP HANA-class, Redis, analytical caches) are capacity-bound, and the HMAA8GR7DJR4N-VK provides 64 GB per module to maximize memory per socket. The x4 DRAM organization combined with ECC is important for these workloads because long-running analytical queries must not silently corrupt rows; x4 enables single-device data correction in the server controller. At DDR4-2666 with dual-rank interleaving, sequential read streams sustain multi-GB/s per channel. Trade-off: latency is slightly higher than UDIMM-class parts, but registered RDIMMs are the only way to reach terabyte-scale system memory, making them mandatory for this class of application.
Recommended
Data Center Memory Upgrades
For refreshing aging DDR4 server fleets, the HMAA8GR7DJR4N-VK is a cost-effective capacity upgrade that plugs into existing DDR4-2666 qualified slots without BIOS changes on platforms listing the -VK family. The 288-pin keyed connector and 1.2V rail match the installed base, and dual-rank topology preserves channel population rules. Because DDR4 supply is contracting as DDR5 ramps, buyers should secure stock early. Performance consideration: when upgrading an existing mixed population, verify all installed modules report the same speed grade, otherwise the memory controller down-clocks the entire system and the upgrade yields no bandwidth gain.
Recommended
OEM Server Builds
Original equipment manufacturers building server SKUs around DDR4-2666 platforms use the HMAA8GR7DJR4N-VK as a standardized 64 GB main-memory building block. SK hynix registered DIMMs follow the JEDEC DDR4 RDIMM definition, including onboard PMIC power management and serialized presence-detect (SPD) data the BIOS uses for automatic training. For volume production, the tape-free tray-packed DIMM format simplifies automated insertion. Consideration: OEMs should validate the specific die revision ('D' in this MPN) against platform memory training firmware, as earlier 'A'-revision modules such as the HMAA8GR7AJR4N-VK are typically covered by the same QVL but should be confirmed.
Recommended
High-Performance Computing Clusters
HPC nodes built on dual-socket DDR4 platforms use RDIMMs like the HMAA8GR7DJR4N-VK where memory bandwidth per watt matters. The 1.2V DDR4 rail and registered buffering keep power per GB low across hundreds of nodes, and the 2Rx4 configuration provides the rank interleaving that bandwidth-sensitive codes (CFD, weather modeling, genomics) rely on. At 2666 MT/s the module supports roughly 21.3 GB/s per channel of theoretical bandwidth. Design consideration: on Intel Xeon Scalable and AMD EPYC platforms, balance channels evenly with identical modules to avoid striding penalties; mixing ranks or speeds across channels degrades sustained bandwidth measurably.
Recommended
Recommended Products Summary
Engineering reference data for HMAA8GR7DJR4N-VK — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMAA8GR7AJR4N-VK | HMAA8GR7CJR4N-XN | HMAA8GR7CJR4N-RD | HMA84GR7DJR4N-VK |
|---|---|---|---|---|---|
| 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 | SK hynix |
| Capacity | 64 GB | 64 GB | 64 GB | 64 GB | 32 GB |
| Speed | DDR4-2666 (PC4-21300) | DDR4-2666 | DDR4-3200 (PC4-25600) | DDR4-3200 class (C-die) | DDR4-2666 |
| Operating Voltage | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V |
| Organization | 2Rx4 | 2Rx4 | 2Rx4 | 2Rx4 | 2Rx4 |
| ECC | Yes | Yes | Yes | Yes | Yes |
| Die Generation | D-series die | A-series die | C-series die | C-series die | D-series die |
Key Differentiators
- Latest D-series die revision in the 64 GB 2666 RDIMM family (vs HMAA8GR7AJR4N-VK)
- Maximum density per slot at lowest platform cost (vs HMA84GR7DJR4N-VK)
- Lower platform qualification risk for DDR4-2666 fleets (vs HMAA8GR7CJR4N-XN)
Design Notes
Never install the HMAA8GR7DJR4N-VK in a desktop or workstation board expecting UDIMMs. Registered DIMMs are only recognized by server chipsets; installation in consumer boards results in no POST and no damage, but wasted diagnostic time. Also confirm the platform QVL lists the -VK or an equivalent 64 GB 2Rx4 DDR4-2666 RDIMM, since some older Xeon E5 v4 platforms cap at 2400 MT/s and will down-clock the module.
When populating a server with multiple HMAA8GR7DJR4N-VK modules, follow the vendor memory population rules: identical MPN, rank, and speed per channel. Mixing the -VK with faster C-series parts such as HMAA8GR7CJR4N-XN is electrically safe but forces the whole system to 2666 MT/s. Fill white-slot-first channel patterns per the server manual to preserve dual-rank interleaving benefits.
Estimated: DDR4 RDIMMs at 1.2V typically dissipate roughly 3-6 W per module under load depending on activity; in dense 24-DIMM chassis, verify inlet airflow meets the server vendor specification for fully populated channels. SK hynix RDIMMs include optional thermal sensor support read by BMC for proactive throttling; do not disable platform fan curves tied to DIMM temperature sensors.
Compliance Information
Server DDR4 RDIMMs of this generation are generally lead-free, but RoHS/REACH statements were not present in the provided verified data; verify with SK hynix product environmental reports.
