Kingston KSM56R46BD4-64HA 64GB 5600MT/S DDR5 ECC Reg CL46 DIMM 2RX4 Hynix

Kingston KSM56R46BD4-64HA 64GB DDR5-5600 ECC Registered Server DIMM

Overview

The Kingston KSM56R46BD4-64HA is a 64GB DDR5-5600 ECC Registered DIMM built for production server platforms where memory reliability and density directly affect workload stability. Running at 5600 MT/s with a 288-pin form factor and 2Rx4 dual-rank configuration, this module targets enterprise workloads — virtualization hosts, database servers, and storage-heavy applications — that demand both high bandwidth and hardware-level error correction. It ships with a Hynix A-die substrate, which carries well-established compatibility across major server platforms from Intel and AMD. If you're evaluating server memory modules for a high-density build, the density and speed grade of this module make it a practical anchor for multi-channel configurations.

Key Features

• 64GB Single-Module Density: Packing 64GB into a single 288-pin DIMM slot means you can deploy high-memory configurations without exhausting all available slots. A 4-channel system with one DIMM per channel reaches 256GB — leaving room to double up if your platform supports 2 DIMMs per channel.
• DDR5-5600 at 5600 MT/s: DDR5-5600 delivers meaningfully higher peak bandwidth than DDR4-3200 — roughly 75% more theoretical throughput. For memory-bound workloads like in-memory databases or large VM fleets, that bandwidth ceiling translates directly to reduced latency under load. Kingston's server memory line at this speed grade is well-suited to Xeon Scalable 4th/5th-gen and EPYC Genoa/Bergamo platforms.
• ECC (Error Correcting Code) with On-Die ECC: Standard ECC corrects single-bit errors and detects multi-bit errors at the DIMM level — non-negotiable for production server environments where a single bit flip can corrupt an in-flight transaction. On-Die ECC (ODECC) adds a second correction layer inside the DRAM die itself, catching errors before they surface at the memory bus. The result is a two-layer error correction stack that's materially more reliable than ECC alone.
• Registered (Buffered) Architecture: The register on an RDIMM buffers command and address signals between the memory controller and the DRAM chips, enabling higher DIMM counts per channel and higher per-slot densities than UDIMMs allow. This is the correct form factor for server platforms — consumer or workstation motherboards typically will not POST with RDIMMs installed.
• CL46 Latency at 5600 MT/s: CAS latency of 46 at 5600 MT/s yields an absolute latency of roughly 16.4 ns — competitive for DDR5 at this speed grade. For latency-sensitive workloads, that absolute figure matters more than the CL number in isolation.
• 1.1V Operating Voltage: DDR5 standardizes at 1.1V, down from DDR4's 1.2V. In a fully populated server with dozens of DIMMs, the per-DIMM power reduction compounds into meaningful thermal and power-supply headroom savings.
• SPD Profile Support: The module includes a programmed SPD (Serial Presence Detect) profile, allowing the server's BIOS/UEFI to auto-detect speed, timing, and voltage parameters without manual configuration — important for deployment reproducibility across large fleets where manual BIOS tuning introduces drift.
• 1.8V VPP Power Rail: The module requires a 1.8V programming power voltage (VPP) for its internal register and SPD logic, consistent with DDR5 platform specifications. Any DDR5-certified server platform will supply this natively — no adapter or special cabling needed.
• 288-Pin DIMM Form Factor: Standard full-length server DIMM — compatible with 1U, 2U, and tower server chassis that support DDR5 registered memory. Not compatible with SO-DIMM or LPDDR slots.

Integration and Compatibility

The KSM56R46BD4-64HA is targeted at PC/server platforms with DDR5 RDIMM support. The Hynix A-die substrate has broad validation across Intel Xeon Scalable (Sapphire Rapids, Emerald Rapids) and AMD EPYC (Genoa, Bergamo) server platforms. Confirm your specific server's Qualified Vendor List (QVL) before purchase — Kingston publishes per-platform compatibility data on their memory configurator. The 2Rx4 rank configuration and 8192M x 80 module geometry are standard for 64GB DDR5 RDIMMs; most DDR5 server platforms support this configuration natively. For server memory planning, note that mixing ranks or speeds within a channel will typically force the entire channel to run at the lowest common denominator speed — populate channels uniformly when possible. Pair with a compatible server power supply sized for the full memory population load, particularly in dense deployments where multiple high-capacity DIMMs are installed.

Frequently Asked Questions

Q: Is the KSM56R46BD4-64HA a registered (buffered) or unbuffered DIMM?

A: It is a Registered (Buffered) DIMM — RDIMM. It requires a server motherboard with RDIMM support. Standard consumer or workstation boards will not accept this module.

Q: What does On-Die ECC add over standard ECC on the KSM56R46BD4-64HA?

A: Standard ECC corrects single-bit errors at the DIMM level. On-Die ECC (ODECC) operates inside the DRAM die itself, catching sub-threshold errors before they appear on the memory bus. Together they form a two-layer correction stack — more robust than ECC alone, particularly at higher data rates where signal integrity margins are tighter.

Q: What server platforms is the KSM56R46BD4-64HA compatible with?

A: The module is designed for DDR5 server platforms — primarily Intel Xeon Scalable (Sapphire Rapids, Emerald Rapids) and AMD EPYC (Genoa, Bergamo) systems. Always verify against your server manufacturer's Qualified Vendor List (QVL) for confirmed compatibility before ordering.

Q: Can the KSM56R46BD4-64HA be installed in a workstation or desktop PC?

A: No. This is a 288-pin DDR5 RDIMM intended for server platforms. Consumer and workstation motherboards typically support only unbuffered DIMMs (UDIMMs) and will not POST with an RDIMM installed.

Q: What operating voltage does the KSM56R46BD4-64HA require?

A: The module operates at 1.1V (standard DDR5 voltage) with a 1.8V VPP rail for the register and SPD logic. Both voltages are supplied natively by any DDR5-compliant server platform — no special configuration required.

Q: Does the KSM56R46BD4-64HA include an SPD profile?

A: Yes. The module ships with a programmed SPD profile, allowing the server BIOS/UEFI to auto-detect and configure speed (5600 MT/s), timings (CL46), and voltage (1.1V) without manual intervention.

Karl Wilson

The KSM56R46BD4-64HA sits at the intersection of density and reliability that defines modern server memory procurement. What stands out here isn't just the 5600 MT/s data rate — it's the combination of On-Die ECC layered on top of standard ECC at that speed. At 5600 MT/s, signal integrity margins are tighter than DDR4, and ODECC acts as the first line of defense inside the die before errors ever surface at the bus. That two-layer correction architecture is worth paying attention to when you're speccing memory for a system that stays up continuously.

Technical Highlights:

• Dual ECC Stack (ODECC + DIMM-level ECC): On-Die ECC catches errors within the DRAM die; conventional ECC handles correction at the channel level. Running both at 5600 MT/s gives you materially stronger error resilience than ECC-only DDR4 platforms.
• 2Rx4 Dual-Rank at 64GB: The 2Rx4 configuration uses two ranks of x4-width chips — higher chip count per module, which typically yields better interleaving and memory controller efficiency versus 1Rx8 configurations at equivalent capacity.
• Row Cycle Time 48 ns / Row Active Time 32 ns: These timing parameters define how quickly the memory controller can cycle through row activations. The 48 ns tRC and 32 ns tRAS are within DDR5-5600 specification norms — no hidden timing penalties here versus other DDR5-5600 RDIMMs.

Deployment Considerations:

• Verify your server's QVL for this specific Hynix A-die variant — some platforms distinguish between die vendors (A, M, R) in their compatibility matrices. Do not assume all 64GB DDR5-5600 RDIMMs are interchangeable across slots on a given platform.
• Mixing this module with DIMMs of different ranks or die vendors on the same memory channel can force a speed downgrade to DDR5-4800 or lower depending on platform behavior — populate channels uniformly in production deployments.

This module is the right call for high-density virtualization hosts running VMware vSphere or Hyper-V on Intel Xeon Sapphire Rapids or AMD EPYC Genoa — platforms where 512GB+ fully populated configurations demand both the density of 64GB RDIMMs and the error correction depth that ODECC provides.