8GB DDR4-3200 RDIMM 1RX8 1.2V
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The SK hynix HMA81GR7CJR8N-XN is an enterprise-grade 8GB DDR4-3200 CL22 single-rank registered ECC DIMM (1Rx8) engineered for modern server infrastructure. Operating at a native 1.2V, this module delivers up to 25.6 GB/s bandwidth for demanding enterprise compute environments. It provides full sideband ECC error correction and command/address buffering via an integrated Registering Clock Driver (RCD).
The HMA81GR7CJR8N-XN is built on SK hynix's 8Gb C-die (CJR) process technology utilizing a 1Rx8 topology. The module populates nine 1Gx8 DRAM packages (eight for 64-bit data payload and one for 8-bit ECC parity) routed to an onboard JEDEC-compliant DDR4 Registering Clock Driver (RCD). The RCD buffers command, address, and clock signals from the host memory controller, mitigating electrical loading and ensuring channel signal integrity across multi-DIMM configurations. Unlike DDR5, which integrates the PMIC and SPD hub directly on the module, DDR4 RDIMMs rely on motherboard-supplied 1.2V VDD/VDDQ and a standard EEPROM SPD with an integrated thermal sensor (TSE-2004av compliant).
Decoding the SK hynix part number: 'HMA' designates SK hynix DDR4 memory; '8' indicates an 8GB total module density; '1G' corresponds to a 1Gx72 bit module organization; 'R' signifies Registered DIMM form factor; '7' denotes the 288-pin RDIMM pinout; 'C' indicates the DRAM die revision (C-die); 'J' designates the 8Gb die density; 'R' specifies a mono-die x8 package; '8' indicates an 8-bit chip width; 'N' designates standard lead-free/halogen-free construction; and '-XN' represents the DDR4-3200 speed bin with standard 22-22-22 timings.
Always verify against your server's qualified vendor list (QVL).
While most enterprise memory controllers can support x4 and x8 RDIMMs on separate channels, mixing x4 and x8 modules within the same channel is not recommended and often unsupported, as it disables advanced features like Chipkill and can force the memory controller to downclock or fail POST.
No. The HMA81GR7CJR8N-XN is a Registered DIMM (RDIMM) containing an RCD chip. Consumer motherboards and processors (e.g., standard Intel Core or AMD Ryzen) only support unbuffered DIMMs (UDIMMs) and will fail to POST with registered server memory.
The 'XN' suffix defines the JEDEC speed and latency grade for this module, indicating DDR4-3200 operating speeds with 22-22-22 timing parameters (CL22) at standard 1.2V.
The HMA81GR7CJR8N-XN T4 AC 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 16 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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