Kingston KSM64R52BD4-64HA System Memory 64GB 6400MT/S DDR5 ECC Reg CL52 DIMM 2RX4 Hynix

Kingston KSM64R52BD4-64HA 64GB DDR5-6400 ECC Registered Server DIMM

Overview

The Kingston KSM64R52BD4-64HA is a 64GB DDR5 Registered ECC DIMM engineered for enterprise and workstation servers that demand high-bandwidth, error-corrected memory at the DDR5-6400 speed grade. Running at 6400 MT/s with CAS latency 52 (CL52) and a 1.1V operating voltage, this module targets platforms where memory throughput and long-haul reliability both matter — think high-channel-count NVR servers, AI inference nodes, and dense virtualization hosts where undetected bit errors are not acceptable. Built around Hynix A-die ICs on a 288-pin RDIMM form factor, the KSM64R52BD4-64HA slots into servers and workstations with DDR5 RDIMM slots and a compatible registered memory controller.

Kingston's server memory line is sourced factory-new with no grey-market or parallel-import exposure — a meaningful distinction when procurement teams need consistent lot quality across a rack build.

Key Features

• 64GB Single-Module Capacity: A full 64GB in a single DIMM slot means you can populate a dual- or quad-channel platform at high density without consuming every available slot. For an 8-slot server, that's up to 512GB total — enough headroom for large VMS databases, AI model weights, or memory-intensive analytics workloads without adding a second chassis.
• DDR5-6400 (6400 MT/s) Data Rate: Running at 6400 MT/s, this module sits at the high end of the DDR5 speed spectrum. Higher transfer rates translate directly into better throughput on memory-bound tasks — video frame buffering in high-channel NVR deployments, large dataset processing, and containerized microservices all benefit from the extra bandwidth headroom compared to DDR5-4800 or DDR5-5600 modules.
• ECC (Error Correcting Code): ECC detects and corrects single-bit memory errors in real time without a system halt. On a server running 24/7 video recording or continuous analytics, this is the difference between silent data corruption and reliable uptime. Non-ECC modules have no such protection — for any server-class workload, ECC is non-negotiable.
• Registered (Buffered) Architecture — 2Rx4: The registered buffer between the memory controller and the DRAM ICs stabilizes signal integrity at high module densities. The 2Rx4 dual-rank, x4 die-width configuration maximizes capacity per module while maintaining compatibility with server platforms that require RDIMM. Dual-rank also allows the memory controller to interleave between ranks for better effective bandwidth utilization.
• CAS Latency 52 (CL52) at 6400 MT/s: CL52 at this speed grade represents a tight absolute latency profile for DDR5-6400 RDIMMs. While latency is less critical than throughput in most server workloads, tighter CAS timings reduce the penalty on random-access patterns — relevant when VMS software is reading scattered metadata from large recording archives.
• 1.1V Operating Voltage: DDR5's native 1.1V supply (down from DDR4's 1.2V) contributes to lower per-module power draw. Across a fully-populated 8-DIMM server, that differential adds up — relevant for dense rack deployments where per-rack power budgets are constrained.
• 1.8V VPP Programming Voltage: The 1.8V VPP rail powers the DRAM's internal voltage regulator. Confirm your server platform supplies a stable 1.8V VPP on DDR5 slots — most modern DDR5-compatible server motherboards do, but this is worth verifying on older or transitional platforms before ordering.
• SPD Profile Included: An on-module SPD (Serial Presence Detect) EEPROM stores the module's timing and voltage parameters. Servers read SPD at POST to configure memory automatically — no manual BIOS tuning required for standard XMP-off operation. This matters in managed server environments where consistent, repeatable provisioning is required.
• Row Cycle Time 48ns / Row Active Time 32ns: These timing parameters define how quickly the DRAM can cycle through row operations. At 48ns tRC and 32ns tRAS, this module is configured for performance-oriented server use, not low-speed embedded applications — matching the 6400 MT/s transfer rate with appropriately aggressive row timings.

Integration and Compatibility

The KSM64R52BD4-64HA requires a server or workstation motherboard with 288-pin DDR5 RDIMM slots and a memory controller that supports DDR5-6400 Registered ECC modules. Not all DDR5 platforms support registered DIMMs — consumer and prosumer boards typically accept only unbuffered (UDIMM) modules. Confirm your platform's QVL (Qualified Vendor List) before ordering. Common compatible platforms include Intel Xeon Scalable (Sapphire Rapids / Emerald Rapids) and AMD EPYC (Genoa and later) server sockets, both of which natively support DDR5 RDIMM at 6400 MT/s speed grades. This module is not compatible with DDR4 slots, desktop consumer platforms, or any system requiring LR-DIMM (Load-Reduced DIMM) only.

For network video recorders and server storage platforms requiring high-density validated memory, confirm slot population rules in your platform manual — many DDR5 server platforms restrict speed grades when all slots are populated. Running two modules per channel may drop the supported speed from 6400 to 5600 MT/s depending on the IMC (Integrated Memory Controller) design. Pair with a purpose-built server component stack for consistent results. For guidance on sizing memory for multi-camera recording deployments, see the camera and system selection guide.

Frequently Asked Questions

Q: Is the KSM64R52BD4-64HA compatible with consumer desktop DDR5 motherboards?

A: No. This is a Registered (Buffered) ECC DIMM designed for server platforms. Consumer and prosumer desktop boards require Unbuffered (UDIMM) DDR5 — inserting an RDIMM into a UDIMM-only slot is physically possible on some boards but will result in the module not being recognized. Verify your platform's QVL before ordering.

Q: Does the KSM64R52BD4-64HA support XMP or EXPO profiles?

A: This module ships with an SPD profile for JEDEC-standard DDR5-6400 operation. Server RDIMMs typically do not carry XMP/EXPO consumer overclocking profiles — the 6400 MT/s rate is the rated JEDEC speed for this module, not an overclocked profile. Server platforms boot at the SPD-specified speed automatically.

Q: What is the difference between this RDIMM and an LRDIMM for the same capacity?

A: An LRDIMM (Load-Reduced DIMM) uses a memory buffer that isolates the electrical load of all DRAM ICs from the memory controller, allowing more modules per channel. This RDIMM uses a register that only buffers command and address signals — it supports up to a defined number of ranks per channel depending on the platform. For most 1-2 DIMM-per-channel configurations, the KSM64R52BD4-64HA RDIMM is the correct and simpler choice. Only move to LRDIMM if your platform requires maximum slot population beyond what RDIMM supports.

Q: Can this module be mixed with other Kingston DDR5 RDIMMs of different speeds?

A: Mixing modules of different speeds causes the platform to default all modules to the lowest common speed — a DDR5-4800 module in the same server will pull the KSM64R52BD4-64HA down to 4800 MT/s. For best results, populate channels with matched modules of identical speed, latency, and rank configuration.

Q: What does the Hynix A-die designation mean for this module?

A: The Hynix A-die refers to the specific DRAM IC silicon revision used in this module. Kingston publishes the IC vendor (Hynix) and die revision (A) in the part number suffix, which allows system administrators and procurement teams to ensure lot consistency across a server build. Some server platforms have QVL entries specific to IC vendor and die revision — confirming the die designation prevents compatibility surprises in validated deployments.

Q: Is the KSM64R52BD4-64HA suitable for 24/7 continuous operation in a surveillance server?

A: Yes. ECC Registered DIMMs are the standard memory class for always-on server workloads. The ECC capability corrects single-bit errors in real time without interrupting the system, and the registered architecture maintains signal integrity under sustained load. This module is appropriate for NVR servers, analytics hosts, and any platform where memory reliability directly impacts recording continuity.

Eden Phillips

When we spec server memory for high-channel NVR builds or analytics-heavy deployments, the KSM64R52BD4-64HA hits the right combination of speed and architecture for platforms where DDR5-6400 RDIMM is the validated memory class. The 6400 MT/s transfer rate at CL52 gives you tighter absolute latency than most DDR5-6400 RDIMMs at this density, and the Hynix A-die is a known-good IC revision on current Intel Xeon and AMD EPYC platforms.

Technical Highlights:

• 6400 MT/s at 1.1V: DDR5's native 1.1V rail means this 64GB module draws less power than a DDR4 equivalent — meaningful when you're filling 8 DIMM slots in a rack-mounted NVR server running 24/7.
• ECC with Registered Buffer: The combination of hardware error correction and the registered command/address buffer is what separates server-grade memory from workstation DIMMs. ECC silently corrects single-bit errors; the register stabilizes signal integrity at high module count — both matter on platforms that never restart.
• SPD Auto-Configuration at CL52: The on-module SPD programs the platform at POST with the rated 6400 MT/s / CL52 / 1.1V profile. No manual BIOS intervention, no risk of misconfigured timings across a multi-server deployment — consistent behavior from first boot.

Deployment Considerations:

• Confirm your server motherboard's QVL explicitly lists DDR5-6400 RDIMM support — not all DDR5-capable boards accept registered modules, and some Xeon platforms cap speed at 5600 MT/s with dual-rank population in all slots.
• The Hynix A-die designation (suffix -64HA) is part of Kingston's IC transparency policy. If your platform QVL is IC-specific, match the die revision exactly — substituting a Micron or Samsung die variant, even at the same speed grade, can affect validation status on some OEM server certifications.

This module is the right fit for a purpose-built NVR server or AI inference host on Intel Sapphire Rapids or AMD EPYC Genoa where DDR5-6400 RDIMM is the validated memory class and the workload demands both throughput and continuous error correction — not a general-purpose desktop upgrade.