8GB DDR4-2933 RDIMM 1Rx8 1.2V
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The SK hynix HMA81GR7CJR8N-WM (HPE Spare L15415-501) is an 8GB DDR4-2933 PC4-23400 single-rank x8 registered ECC DIMM designed for enterprise server workloads. Operating at a standard 1.2V, this module provides reliable, high-bandwidth memory for 2nd Generation Intel Xeon Scalable and AMD EPYC Rome server deployments. It features enterprise-grade hardware ECC and an onboard Registering Clock Driver (RCD) to guarantee signal integrity across multi-channel memory configurations.
The HMA81GR7CJR8N-WM is engineered using SK hynix 8Gb C-die (CJR) DRAM silicon, structured in a 1Rx8 rank organization. The module utilizes nine 1Gx8 DRAM packages across a 72-bit bus (64 data bits plus 8 sideband parity bits for enterprise ECC handling single-bit correction and multi-bit detection). A dedicated DDR4 Registering Clock Driver (RCD) buffers command, address, and control clock lines between the host CPU memory controller and DRAM components, reducing electrical loading across memory channels.
Decoding the SK hynix part number shows 'HMA' indicating DDR4 SDRAM, '8' for 8GB module density, '1G' for 1G x 72 address configuration, 'R' for Registered DIMM form factor, '7' denoting 288-pin connector, 'C' identifying C-die DRAM generation, 'JR' designating package details, 'R8' specifying 1Rx8 organization, and '-WM' indicating DDR4-2933 speed with CL21 latency. The secondary identifier L15415-501 confirms certification and deployment under HPE ProLiant Gen10 SmartMemory ecosystems. Power management is delivered through standard motherboard 1.2V VDD rails and an on-DIMM SPD EEPROM.
Always verify against your server's qualified vendor list (QVL).
L15415-501 is the official Hewlett Packard Enterprise (HPE) spare part number for an 8GB 1Rx8 DDR4-2933 RDIMM, manufactured by SK hynix as HMA81GR7CJR8N-WM with HPE-certified SmartMemory SPD parameters.
Yes, mixing ranks across separate memory channels is supported by modern memory controllers; however, within the same channel, mixing different ranks or configurations (such as x4 and x8) may force the memory bus to downclock or disable advanced channel interleaving. It is recommended to populate matching modules per channel for optimal stability.
No, the HMA81GR7CJR8N-WM is a Registered DIMM (RDIMM) requiring server or workstation platforms with RCD-capable enterprise chipsets (e.g., Intel C620 series or AMD SP3); it will not POST in standard consumer motherboards.
The HMA81GR7CJR8N-WM TG AC - L15415-501 is a TAA-compliant enterprise server memory module (8GB DDR4-2933 RDIMM 1Rx8 1.2V). Sold as certified refurbished with a 1-year warranty and same-day US shipping when in stock. We stock 5 units of this SKU today.
Compatible with enterprise servers requiring this exact configuration. Bulk orders welcome — quotes typically returned within one business hour. Payment terms: NET-30 for approved accounts, or instant on-chain payment via USDC/ETH on Base or Ethereum for autonomous AI agents and Web3 buyers.
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