8GB DDR4-3200 RDIMM 1RX8 1.2V
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The SK hynix HMA81GR7CJR8N-XN is an 8GB DDR4-3200 PC4-25600 single-rank registered ECC DIMM designed for enterprise server and workstation platforms. Operating at standard 1.2V, it delivers 25.6 GB/s peak bandwidth per module with integrated Register Clock Driver (RCD) buffering for enhanced bus stability. It is optimized for 2nd/3rd Gen Intel Xeon Scalable and AMD EPYC 7002/7003 processor ecosystems.
The HMA81GR7CJR8N-XN utilizes SK hynix 8Gb C-die (CJR) DRAM ICs fabricated on an advanced 1y-nm process node. The module is configured in a 1Rx8 layout consisting of nine discrete 1Gx8 DRAM packages (eight for data payload and one dedicated to sideband ECC parity) mounted on a 288-pin JEDEC-standard raw card. A central Register Clock Driver (RCD) re-drives and conditions the command, address, and clock signals from the host memory controller, mitigating electrical capacitive loading on the server memory bus while data lanes pass directly to the DRAMs.
Decoding the SK hynix part number shows: 'HMA' signifies SK hynix DDR4 memory; '81G' denotes an 8GB module based on 1G-word density; 'R7' indicates a 288-pin registered ECC DIMM; 'C' identifies C-die revision; 'JR' represents the package and operating profile; '8' specifies x8 chip bit width; 'N' designates non-lead/halogen-free green packaging; and '-XN' represents the DDR4-3200 speed tier running at standard CL22-22-22 timings at 1.2V nominal VDD/VDDQ. Suffixes 'TG AD' reflect internal vendor assembly, stepping, or OEM-specific manufacturing identifiers.
Always verify against your server's qualified vendor list (QVL).
No. RDIMMs, LRDIMMs, and UDIMMs utilize fundamentally distinct signaling and electrical drive architectures and cannot be populated together within the same system or memory channel.
Yes. The module's SPD EEPROM includes standardized JEDEC fallback profiles that automatically clock down to 2933 MT/s, 2666 MT/s, 2400 MT/s, or 2133 MT/s to match the host platform's maximum memory bus frequency.
In an enterprise x8 ECC module, eight DRAM chips provide the 64-bit data path, while the ninth DRAM chip provides an 8-bit bus extension dedicated to Error-Correcting Code (ECC) parity checks for Single-Bit Error Correction and Double-Bit Error Detection (SEC-DED).
The HMA81GR7CJR8N-XN TG AD is a TAA-compliant enterprise server memory module (8GB DDR4-3200 RDIMM 1RX8 1.2V). Sold as certified refurbished with a 1-year warranty and same-day US shipping when in stock. We stock 17 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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