HMA84GR7CJR4N-PB - 32GB DDR4-2933 ECC RDIMM | SK hynix | Server Memory
MPN: HMA84GR7CJR4N-PB β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $155 | $155.00 |
| 10 | $149 | $1,490.00 |
| 100 | $142 | $14,200.00 |
| 500 | $136 | $68,000.00 |
| 1,000 | $129 | $129,000.00 |
Drop-in alternatives for HMA84GR7CJR4N-PB 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:
HMA84GR7CJR4N-WM
β Drop-Inβ In Stock
$69 / Unit
View Datasheet βHMA84GR7CJR4N-XN
β Drop-Inβ In Stock
$383.72 / Unit
View Datasheet βHMA84GR7CJR4N-VK
β Drop-Inπ Reference alternative (not in catalog)
MTA18ASF4G72AZ-2G9B1
β Drop-Inπ Reference alternative (not in catalog)
M393A4K40DB3-CWE
β Drop-Inπ Reference alternative (not in catalog)
KSM29RD8/32ME
β Drop-Inπ Reference alternative (not in catalog)
HMA84GR7CJR4N-PB Maximum Ratings & Electrical Characteristics
| Module Type | DDR4 ECC Registered DIMM (RDIMM) |
| Capacity | 32 GB |
| Data Rate | DDR4-2933 (PC4-23466) |
| Organization | 4G x 72 |
| Ranks | 2 (Dual Rank, 2Rx4) |
| DRAM Devices | 36 FBGA (78-ball) 2Gx4, 8Gb C-die |
| Operating Voltage | 1.2 V |
| Form Factor | 288-pin DIMM |
| ECC | Yes (registered with ECC) |
| Buffering | Registered / command-address buffered |
| Die Generation | C-die (JR) |
| Finish | Pb-free (PB suffix) |
| JEDEC Compliance | JEDEC-standard DDR4 RDIMM |
| Mounting Type | Slot-mounted server DIMM |
| RoHS Status | Pb-free suffix (PB) |
HMA84GR7CJR4N-PB standard Pin Configuration Guide
Complete pinout information for HMA84GR7CJR4N-PB (standard package). 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 HMA84GR7CJR4N-PB.
Refer to the datasheet for full pin configuration.
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
HMA84GR7CJR4N-PB is suitable for 6 applications: Enterprise Rack Servers, Virtualization Hosts, Database and Analytics Nodes, OEM Server Upgrades (Dell/HPE/Lenovo), Storage and Backup Systems, Workstations and Edge Compute.
Enterprise Rack Servers
The HMA84GR7CJR4N-PB is purpose-built for 1U/2U enterprise rack servers from Dell, HPE, and Lenovo that accept JEDEC-standard 288-pin DDR4 RDIMMs. Its 32 GB capacity and DDR4-2933 data rate (PC4-23466R) provide 23.4 GB/s per module of theoretical bandwidth at 1.2 V, while registered command-address buffering keeps electrical loading low enough for fully populated channels (typically 8 DIMMs per channel on two-socket platforms). The dual-rank 2Rx4 organization improves memory-level parallelism versus single-rank modules at the same frequency, and ECC protects against single-bit errors that could otherwise crash long-running services. Mixing speed bins causes all channels to train to the lowest common speed, so populate uniformly.
Recommended
Virtualization Hosts
For VMware ESXi, KVM, or Hyper-V consolidation hosts, memory capacity per socket directly caps VM density, and the 32 GB per-module density of the HMA84GR7CJR4N-PB lets a dual-socket server reach 512 GB (16 slots) or 1 TB (32 slots) with a single SKU. ECC registered operation is essential here: an uncorrected single-bit error can halt a hypervisor running dozens of guest machines. The x4 device topology supports advanced correction (SDDC/lockstep) on supported controllers, further improving reliability versus x8 modules. At DDR4-2933, sustained bandwidth is sufficient for typical mixed virtual workloads; for bandwidth-bound guests, prefer identical dual-rank modules across all channels to maximize interleaving.
Recommended
Database and Analytics Nodes
In-memory databases (SAP HANA-class, Redis, MemSQL) and analytics engines are limited by both RAM capacity and bandwidth. The HMA84GR7CJR4N-PB contributes 32 GB at DDR4-2933 per module; populating all channels with dual-rank modules enables the memory controller to interleave across ranks and channels, approaching the platform's peak bandwidth. ECC is non-negotiable for transactional databases, and the registered interface maintains signal integrity at high slot counts, which unbuffered UDIMMs cannot support. For OEM-locked database appliances from HPE or Lenovo, this module maps directly to OEM SKUs such as P07646-B21 and 4X77A08633, simplifying fleet-standard memory procurement.
Recommended
OEM Server Upgrades (Dell/HPE/Lenovo)
Field upgrades of installed server fleets are a primary use case for this exact part number. Cross-reference data confirms that Dell 99L0497-001.A00, HPE P07646-B21, and Lenovo 4X77A08633 are OEM brandings of SK hynix HMA84GR7CJR4N-family modules, so the bare MPN is hardware-identical to the boxed OEM upgrade at a lower price point. Because it is a JEDEC-standard 288-pin RDIMM, installation requires only that the platform support RDIMMs and the DDR4-2933 bin; on 2666-only platforms the module down-clocks automatically with no configuration change. Always match rank and speed class when adding modules to existing populated channels to avoid asymmetric interleaving.
Recommended
Storage and Backup Systems
Enterprise storage controllers, NAS heads, and backup appliances rely on large host-side caches where ECC memory prevents silent data corruption in cached writes. The HMA84GR7CJR4N-PB's 32 GB capacity per module lets storage nodes reach multi-hundred-GB cache footprints without exhausting DIMM slots, and the registered interface supports the high slot counts typical of 2U storage platforms. At 1.2 V and DDR4-2933, power per module is modest relative to the capacity delivered, helping keep dense chassis within thermal budgets. x4 ECC organization adds another integrity layer on controllers supporting advanced RAS features, protecting data between disk and cache.
Recommended
Workstations and Edge Compute
High-end workstations and edge compute appliances built on server-class chipsets (Intel Xeon W/Scalable, AMD EPYC embedded) that accept RDIMMs can use the HMA84GR7CJR4N-PB for 32 GB per slot of ECC-protected capacity. For CAD, simulation, and AI inference at the edge, dual-rank DDR4-2933 provides strong sustained bandwidth, while ECC prevents error-induced simulation divergence on multi-day compute jobs. Note that consumer desktop boards with UDIMM-only slots are not compatible - this module will not boot there. Edge enclosures with limited airflow benefit from the module's standard-height, single-sided-register thermal profile typical of 2Rx4 RDIMMs.
Recommended
Recommended Products Summary
Engineering reference data for HMA84GR7CJR4N-PB β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | HMA84GR7CJR4N-WM | HMA84GR7CJR4N-XN | MTA18ASF4G72AZ-2G9B1 | M393A4K40DB3-CWE | KSM29RD8/32ME |
|---|---|---|---|---|---|---|
| Package | 288-pin DDR4 RDIMM | 288-pin DDR4 RDIMM - same | 288-pin DDR4 RDIMM - same | 288-pin DDR4 RDIMM - same | 288-pin DDR4 RDIMM - same | 288-pin DDR4 RDIMM - same |
| Brand | SK hynix | SK hynix | SK hynix | Micron Technology | Samsung Electronics | Kingston |
| Capacity | 32 GB | 32 GB | 32 GB | 32 GB | 32 GB | 32 GB |
| Data Rate | DDR4-2933 (PC4-23466R) | DDR4-2933 | DDR4-3200 | DDR4-2933 | DDR4-3200 | DDR4-2933 |
| Organization / Ranks | 4G x 72, 2Rx4 | 4G x 72, 2Rx4 | 4G x 72, 2Rx4 | 4G x 72, 2Rx4 | 4G x 72, 2Rx4 | 4G x 72, 2Rx4 |
| Operating Voltage | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V | 1.2 V |
| ECC Registered | Yes | Yes | Yes | Yes | Yes | Yes |
| OEM Cross-Reference | Dell 99L0497 / HPE P07646-B21 (family) | Dell 99L0497-001.A00 | HPE P07646-B21 / Lenovo 4X77A08633 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- Native DDR4-2933 speed bin (vs HMA84GR7CJR4N-VK)
- Direct OEM channel cross-references (vs MTA18ASF4G72AZ-2G9B1)
- Cost efficiency at same bin vs faster variant (vs HMA84GR7CJR4N-XN)
Design Notes
Never install this RDIMM in a platform that only supports UDIMMs or LRDIMMs - RDIMMs and LRDIMMs cannot be mixed, and unbuffered slots will not train registered modules at all. Verify the server QVL before purchase, especially on OEM-locked platforms (HPE, Dell iDRAC/Lifecycle memory validation). Mixing speed bins (-VK 2666 with this 2933 part) causes all channels to run at the slower speed, so keep speed classes uniform per system. Mixing ranks within a channel is generally allowed but may reduce interleaving efficiency.
DDR4 RDIMMs at 1.2 V typically draw roughly 3-5 W per module under load (estimate based on standard 32GB 2Rx4 RDIMM power budgets, not a datasheet figure). In dense 1U platforms with 16-24 modules, aggregate memory power can reach 100 W or more, so verify chassis airflow across DIMM slots and keep inlet air within the module's specified operating temperature. Deploying all channels at DDR4-3200 variants (-XN) slightly increases power versus 2933 operation.
When adding modules to an already populated server, match rank count (2Rx4) and speed class to existing modules so the memory controller can maintain symmetric interleaving across channels. Install pairs or quads per the platform's population rules (white slots first on most OEM boards). After installation, confirm training results and ECC status in BIOS or iDRAC/OneIR logs, and run a full memory diagnostic (for example the OEM offline diagnostic) before returning the system to production.
Compliance Information
The -PB suffix denotes Pb-free finish. Full RoHS/REACH declarations were not present in the provided web data.
