Samsung MDRR644QDBC2-3L000 64G DDR5 6400 RDIMM
The Samsung MDRR644QDBC2-3L000 is a 64GB DDR5 ECC Registered DIMM (RDIMM) running at 6400 MT/s, aimed at enterprise buyers upgrading server platforms for virtualization hosts, cloud infrastructure, and HPC clusters. As a DDR5 RDIMM, it only fits motherboards that explicitly support DDR5 registered memory and will not operate in DDR4 or UDIMM-oriented platforms. Confirm your platform’s qualified vendor list (QVL) and BIOS support for 6400 MT/s before ordering, since many boards downclock to lower default speeds.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Model Number | MDRR644QDBC2-3L000 |
| Brand | Samsung |
| Memory Type | DDR5 ECC RDIMM (Registered DIMM) |
| Capacity | 64GB |
| Data Rate | 6400 MT/s (platform dependent; verify QVL) |
| Speed Grade | PC5-51200R |
| Rank Configuration | 2Rx4 (dual-rank, x4 DRAM organization) |
| Error Correction | ECC Supported (requires ECC-capable platform) |
| CAS Latency | CL52 |
| Operating Voltage | 1.1V |
| Pin Count | 288-pin |
| Form Factor | RDIMM (Registered DIMM) |
| DRAM Organization | x4-based DRAM |
| Memory Bandwidth | 51.2 GB/s |
| Operating Temperature | 0°C to 95°C |
| Compliance | JEDEC DDR5 Standard |
| Applications | Enterprise Servers, Data Centers, Cloud Computing, Virtualization, HPC |
Good to know
- RDIMMs cannot be mixed with UDIMMs or LRDIMMs on the same channel, and DDR5 modules are not backward compatible with DDR4 slots; populate memory channels symmetrically (typically pairs or per your server manual) for optimal performance.
- At 64GB with 2Rx4 x4-based DRAM, this module sits in the mainstream enterprise tier of Samsung’s DDR5 RDIMM lineup — higher per-socket density than 32GB modules while remaining more cost-effective than larger-capacity options for most virtualization and cache-tier workloads.
- For large virtualization hosts, consider sourcing matched modules of identical part number, speed grade, and rank configuration to avoid mixed-population instability; request lot-matched stock when deploying multiple servers.
For tray and reel pricing, current stock by part number and date code, and volume discounts on bulk orders, request a bulk quotation.
The Samsung MDRR644QDBC2-3L000 is a 64GB DDR5 ECC Registered DIMM (RDIMM) running at 6400 MT/s, aimed at enterprise buyers upgrading server platforms for virtualization hosts, cloud infrastructure, and HPC clusters. As a DDR5 RDIMM, it only fits motherboards that explicitly support DDR5 registered memory and will not operate in DDR4 or UDIMM-oriented platforms. Confirm your platform’s qualified vendor list (QVL) and BIOS support for 6400 MT/s before ordering, since many boards downclock to lower default speeds.
Key specifications (table)
| Parameter | Specification |
|---|---|
| Model Number | MDRR644QDBC2-3L000 |
| Brand | Samsung |
| Memory Type | DDR5 ECC RDIMM (Registered DIMM) |
| Capacity | 64GB |
| Data Rate | 6400 MT/s (platform dependent; verify QVL) |
| Speed Grade | PC5-51200R |
| Rank Configuration | 2Rx4 (dual-rank, x4 DRAM organization) |
| Error Correction | ECC Supported (requires ECC-capable platform) |
| CAS Latency | CL52 |
| Operating Voltage | 1.1V |
| Pin Count | 288-pin |
| Form Factor | RDIMM (Registered DIMM) |
| DRAM Organization | x4-based DRAM |
| Memory Bandwidth | 51.2 GB/s |
| Operating Temperature | 0°C to 95°C |
| Compliance | JEDEC DDR5 Standard |
| Applications | Enterprise Servers, Data Centers, Cloud Computing, Virtualization, HPC |
Good to know
- RDIMMs cannot be mixed with UDIMMs or LRDIMMs on the same channel, and DDR5 modules are not backward compatible with DDR4 slots; populate memory channels symmetrically (typically pairs or per your server manual) for optimal performance.
- At 64GB with 2Rx4 x4-based DRAM, this module sits in the mainstream enterprise tier of Samsung’s DDR5 RDIMM lineup — higher per-socket density than 32GB modules while remaining more cost-effective than larger-capacity options for most virtualization and cache-tier workloads.
- For large virtualization hosts, consider sourcing matched modules of identical part number, speed grade, and rank configuration to avoid mixed-population instability; request lot-matched stock when deploying multiple servers.
For tray and reel pricing, current stock by part number and date code, and volume discounts on bulk orders, request a bulk quotation.
