DDR4 RDIMM

HMA84GR7CJR4N-RD

HMA84GR7CJR4N-RD - 32GB DDR4-2933 ECC RDIMM | SK hynix

The SK hynix HMA84GR7CJR4N-RD is a 32GB DDR4-2933 registered DIMM (RDIMM) with ECC, organized as 4G x 72 in a dual-rank (2Rx4) configuration on a 288-pin module, operating at 1.2V and delivering 23466 MB/s bandwidth (PC4-23466R). A registered DIMM is a memory module that buffers the address and command signals through a register IC before they reach the DRAM devices, reducing electrical loading on the memory controller and allowing servers to populate more DIMM slots per channel than unbuffered memory allows. RDIMMs sit at the enterprise tier of the memory hierarchy: DDR4 SDRAM device -> module (RDIMM) -> server memory subsystem. ECC (Error Correcting Code) logic detects and corrects single-bit memory errors, which is mandatory for data integrity in servers, storage controllers, and mission-critical workstations. Key features of the HMA84GR7CJR4N-RD include 32GB capacity built from 8Gb C-die DDR4 SDRAM devices packaged in 78-ball FBGA, x4 device organization for robust single-device-data-correction (SDDC) when paired with ECC-aware controllers, and a 2933 Mbps data rate at JEDEC-standard CL21 timing. The registered architecture lowers reflected-wave loading so a dual-socket server can carry 12 or more modules per system without signal integrity degradation. Technically, the module uses a termination regulator and register on-board, runs at the 1.2V DDR4 core voltage, and complies with the DDR4 RDIMM mechanical standard: 288-pin, dual in-line, 1.18 inch (30 mm) height profile with gold-plated edge contacts. The 2Rx4 dual-rank organization interleaves row access between two physical ranks, improving effective bandwidth versus single-rank modules in multi-DIMM-per-channel servers. Typical applications include HPE ProLiant and Dell PowerEdge server memory upgrades, virtualization hosts, database servers, and high-memory workstations that require ECC Registered DDR4. The module cross-references to OEM part numbers such as HPE P07646-B21 class SKUs used in validated server configurations. Design consideration: never mix RDIMMs with LRDIMMs or UDIMMs in the same channel, and always verify the server memory population rules - matched ranks, speeds, and vendor-qualified DIMM lists determine the final achievable data rate, which may be derated from 2933 Mbps in mixed configurations. This page adds value beyond the SK hynix datasheet by consolidating drop-in SK hynix RDIMM speed variants (2666/2933/3200 Mbps), distributor pricing context, and practical server population guidance in one AI-citable reference. Pricing data reflects available listings as of 2026-09-05.