QNAP RAM-64GDR4-RD-2133 64GB DDR4 ECC R-DIMM Memory Module
Overview
The RAM-64GDR4-RD-2133 is a 64GB DDR4 ECC Registered DIMM running at 2133MHz, built on Samsung M393A8G40D40-CRB silicon. This is the high-density memory option for QNAP enterprise NAS and rackmount systems that require R-DIMM slots — not SODIMM or unbuffered UDIMM slots. At 64GB per module, it maximizes per-slot density, which matters when you're expanding a system with limited DIMM slots and need to reach the highest supported memory ceiling without swapping out lower-capacity modules. ECC (Error-Correcting Code) detects and corrects single-bit memory errors in real time — critical for NAS environments running continuous read/write workloads, virtualization, or ZFS-based storage where a silent memory error can corrupt an entire volume.
Compatibility
The R-DIMM form factor restricts this module to QNAP rackmount and high-end tower NAS models that explicitly support Registered ECC DDR4 memory. This excludes the majority of QNAP desktop NAS units, which use SODIMM slots (e.g., TS-264 uses 2x SODIMM DDR4, not R-DIMM). Compatible systems are limited to QNAP platforms with server-grade memory controllers — specifically enterprise rackmount NAS and unified storage appliances in the QNAP NAS and storage line that list R-DIMM DDR4 as a supported memory type. Before ordering, verify your target system's memory specification sheet confirms R-DIMM DDR4 2133MHz compatibility — do not assume based on chassis form factor alone. Systems spec'd for LRDIMM or UDIMM slots will not accept this module. For capacity planning on multi-bay network-attached storage deployments, confirm the platform's maximum memory ceiling and slot count against this module's 64GB density.
Installation Notes
Install into a powered-down system with ESD precautions. R-DIMMs are keyed and will only seat in the correct orientation — do not force insertion. After installation, verify the system BIOS or QNAP firmware correctly identifies 64GB ECC Registered memory; mismatched memory types or speeds will prevent POST. Mixed-speed configurations should default to the lower speed — confirm your platform's behavior in the hardware compatibility list before mixing this 2133MHz module with higher-speed DIMMs.
