8GB DDR4-2933 RDIMM 1Rx8 1.2V
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The SK hynix HMA81GR7CJR8N-WM (HPE spare part number L15415-501) is an enterprise-grade 8GB DDR4-2933 PC4-23400 Registered DIMM (RDIMM). Operating at a power-efficient 1.2V, this single-rank x8 module provides error-correcting code (ECC) reliability and high-speed data transfer for enterprise servers. It is optimized for 2nd Generation Intel Xeon Scalable and AMD EPYC platforms, delivering robust memory bandwidth and platform stability.
The HMA81GR7CJR8N-WM is engineered on SK hynix's 8Gb CJR (C-die) DRAM generation organized in a 1Rx8 topology. The module populates nine 1Gx8 physical DRAM packages across a 288-pin layout, where eight devices serve primary 64-bit data lines and one device supports the 8-bit ECC parity bus. As a Registered DIMM (RDIMM), it incorporates an on-board Registering Clock Driver (RCD) to re-drive command, address, and clock signals, reducing capacitive load on the server processor's memory bus and enabling greater memory expansion.
Decoding the SK hynix part number: 'HMA' specifies SK hynix DDR4 memory; '81G' denotes an 8GB capacity with 1Gx72 bit width; 'R' specifies an RDIMM form factor; '7' indicates a 72-bit ECC bus; 'C' refers to the 1y-nm CJR die revision; 'J' represents 8Gb die density; 'R8' defines the 1Rx8 rank and chip organization; 'N' designates standard non-heat spreader lead-free packaging; and 'WM' denotes DDR4-2933 speed with CL21 latency (21-21-21 timing). The suffix 'L15415-501' reflects the direct HPE OEM Spare Part Number equivalent to HPE SmartMemory Option P00918-B21.
Always verify against your server's qualified vendor list (QVL).
The L15415-501 number is an HPE OEM Spare Part Number, signifying that this specific SK hynix module is qualified and pre-programmed with HPE SmartMemory SPD data for seamless integration in HPE ProLiant Gen10 servers.
Yes, the module is fully backward compatible. If installed in an older system or alongside a CPU limited to 2666 MT/s or 2400 MT/s, the JEDEC SPD profiles will automatically clock the module down to the platform's supported speed.
While most server memory controllers allow mixing ranks and chip configurations across different memory channels, it is not recommended to mix 1Rx8 with x4 devices within the same memory channel as it may disable channel interleaving or cause timing mismatches.
The HMA81GR7CJR8N-WM T4 AD - 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 4 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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