HMAA8GR7DJR4N-VK - 64GB DDR4-2666 RDIMM 288-Pin | SK hynix
MPN： HMAA8GR7DJR4N-VK ✓ 啟用中HMAA8GR7DJR4N-VK 概覽
A registered DIMM (RDIMM) is a memory module that buffers the address, command, and control signals through a register chip before they reach the DRAM devices. This buffering reduces the electrical load on the memory controller, allowing servers to support higher module counts per channel than unbuffered UDIMMs. RDIMMs occupy the top of the memory hierarchy for mission-critical computing: memory module -> registered DIMM -> DDR4 SDRAM family -> volatile main memory. The HMAA series is based on SK hynix 8Gb-class DDR4 DRAM die in FBGA packaging.
Key features include 64 GB capacity per module, dual-rank x4 organization which enables single-bit error correction with the on-module ECC logic, a 288-pin edge connector with keyed notches that prevent insertion into incompatible slots, and a 1.2V supply typical of the DDR4 generation, cutting module power roughly in half versus DDR3 at equivalent bandwidth. The -VK speed grade is qualified for 2666 MT/s operation in server platforms.
The registered architecture uses a register IC on the command/address path and a onboard PMIC (management power rail per JEDEC DDR4 RDIMM definition) to deliver stable VDD to the DRAM stacks. At 2666 MT/s with CL19-class latency, the module sustains approximately 21.3 GB/s per channel of theoretical peak bandwidth. Thermal behavior is managed through a thermal sensor option and spreader-free standard-height PCB.
Typical applications include enterprise server main memory for 2-socket rack servers such as Dell PowerEdge, HPE ProLiant, and Lenovo ThinkSystem platforms, virtualization hosts with high VM density, and in-memory database workloads where capacity per channel directly determines workload footprint. Data-center memory upgrades and OEM server builds are the primary purchase contexts.
Design and installation consideration: this RDIMM must only be installed in registered-memory server platforms; it is electrically and mechanically incompatible with desktop UDIMM or SODIMM slots. Mixing -VK parts with different speed grades typically forces the whole channel down to the lowest common speed.
This page synthesizes distributor availability data, same-footprint drop-in alternatives within the SK hynix DDR4 RDIMM family, and practical deployment notes beyond the raw part number decode.
直接替換替代品，適用於 HMAA8GR7DJR4N-VK — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： HMAA8GR7DJR4N-VK （相同外形與佔位） — 差異在於 ECC, Module Type, Organization, Form Factor, Memory Capacity.
HMAA8GR7AJR4N-VK
✅ 直接替換📋 參考替代品（不在目錄中）
HMAA8GR7CJR4N-XN
✅ 直接替換📋 參考替代品（不在目錄中）
HMAA8GR7CJR4N-RD
✅ 直接替換聯絡詢價
查看資料表 →HMAA8GR7AJR4N-WM
✅ 直接替換📋 參考替代品（不在目錄中）
HMA84GR7DJR4N-VK
✅ 直接替換✓ 有庫存
$377.3438 / 單位
查看資料表 →HMAA8GR7CJR4N-RD
✅ 直接替換聯絡詢價
查看資料表 →HMAA8GR7DJR4N-VK 最大額定值與電氣特性
| Memory Capacity | 64 GB |
| 記憶體類型 | DDR4 SDRAM |
| Module Type | 288-pin Registered DIMM (RDIMM) with ECC |
| Speed | 2666 MT/s (PC4-21300) |
| Operating Voltage | 1.2 V |
| 組織 | 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 腳位配置指南
HMAA8GR7DJR4N-VK（standard 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： HMAA8GR7DJR4N-VK.
請參閱 資料表 以查看完整腳位配置。
典型應用
HMAA8GR7DJR4N-VK 適用於 6 應用s: 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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
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.
推薦
推薦產品摘要
工程參考資料，適用於 HMAA8GR7DJR4N-VK — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | 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 |
主要差異化特點
- Latest D-series die revision in the 64 GB 2666 RDIMM family (對比HMAA8GR7AJR4N-VK)
- Maximum density per slot at lowest platform cost (對比HMA84GR7DJR4N-VK)
- Lower platform qualification risk for DDR4-2666 fleets (對比HMAA8GR7CJR4N-XN)
設計說明
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.
合規資訊
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.
