Kingston KSM56R46BS8-16HA Server Premier Memory 16GB 5600MT/S DDR5 ECC Reg CL46 DIMM 1RX8 Hynix

Kingston KSM56R46BS8-16HA Server Premier 16GB DDR5 ECC Registered DIMM

Overview

The Kingston KSM56R46BS8-16HA is a 16GB DDR5-5600 ECC Registered DIMM from the Kingston Server Premier line, purpose-built for enterprise servers and workstations that demand both high bandwidth and memory integrity. Running at 5600 MT/s with a CAS latency of CL46, it delivers the throughput needed for compute-dense workloads — database servers, virtualization hosts, NVR backend systems, and analytics platforms — without trading away reliability. If you're speccing memory for a rack that runs 24/7, this is the profile to evaluate. This is a 288-pin DDR5 RDIMM in a 1Rx8 single-rank configuration using Hynix A-die ICs, verified to Kingston's Server Premier qualification standards.

Key Features

• DDR5-5600 at 5600 MT/s: Nearly double the peak bandwidth of DDR4-3200 on a per-channel basis. For servers running concurrent VMs, high-resolution video analytics, or large in-memory datasets, the additional headroom translates directly to lower memory stall cycles and faster throughput under load.
• 16GB Single DIMM (1 x 16GB): A 16GB single-stick footprint gives flexibility in mixed-population configurations. Populate one slot to start and scale to full channel capacity without pulling existing modules — useful in phased-deployment rack builds where budget is staged across quarters.
• ECC (Error Correcting Code) — Registered (Buffered): The registered (buffered) design offloads command/address signal load from the memory controller to an on-DIMM register, enabling higher DIMM counts per channel. This matters in high-density server configurations where you need to fill 8 or more DIMM slots reliably.
• On-Die ECC (ODECC): DDR5 mandates On-Die ECC at the chip level as part of the specification — each Hynix A-die corrects single-bit errors internally before data leaves the DRAM array. Combined with the host-side ECC (RAS features at the memory controller), this gives you two independent error-correction layers — a meaningful reliability delta versus non-ECC consumer modules in always-on deployments.
• CAS Latency CL46, Row Cycle Time 48ns: At 5600 MT/s, CL46 represents a competitive latency profile. Row active time of 32ns and row precharge time of 16 ticks keep random-access penalty in check for mixed read/write workloads typical in surveillance storage servers and transactional databases.
• 1.1V Operating Voltage: DDR5's native 1.1V supply (down from DDR4's 1.2V) reduces per-module power draw. In a fully populated 16-DIMM server chassis, that delta aggregates — lower heat output means less cooling overhead and better PSU efficiency at scale.
• 1Rx8 Single-Rank Configuration: Single-rank modules allow the memory controller to optimize command scheduling with lower rank-switching overhead. For workloads with high sequential bandwidth demands — video ingest, bulk analytics queries — single-rank 1Rx8 layouts often outperform dual-rank at equivalent capacity on the same controller.
• 288-Pin DIMM, 2048M x 80 Module Configuration: The x80 data width (64-bit data + 16-bit ECC) is the standard RDIMM configuration for server platforms. The 288-pin DDR5 socket is physically distinct from DDR4 — confirm your motherboard supports DDR5 RDIMMs before ordering.
• SPD Profile Included: The module ships with a programmed SPD (Serial Presence Detect) profile, so the server's BIOS/UEFI reads the correct speed, timings, and voltage at POST without manual XMP/EXPO overrides. Important for server platforms that enforce JEDEC-standard initialization for RAS compliance.
• Hynix A-Die ICs: IC vendor and die revision are specified in the part number suffix (-16HA = Hynix A). For memory-sensitive applications — high-availability clusters, ECC-strict environments — knowing the die source removes guesswork about what's inside the module.

Integration and Compatibility

The KSM56R46BS8-16HA is designed for server platforms with DDR5 RDIMM support. DDR5 RDIMMs are not backward-compatible with DDR4 slots — the 288-pin DDR5 connector is keyed differently. Verify that your target platform (Intel Xeon Scalable 4th/5th Gen, AMD EPYC Genoa/Bergamo, or equivalent) explicitly lists DDR5 RDIMM support in its memory qualification list (MQL/QVL). The 1Rx8 single-rank topology is broadly supported across DDR5 server platforms, but mixed-rank population (1Rx8 alongside 2Rx4 or 2Rx8 modules in the same channel) may trigger platform-specific speed downgrades — consult your OEM memory population guidelines before mixing ranks in the same channel. The 5600 MT/s rated speed requires a platform memory controller capable of DDR5-5600; older DDR5 platforms may train at a lower validated speed (e.g., DDR5-4800 or DDR5-5200) depending on QVL certification. Kingston's Server Premier line is validated against specific server platforms — use Kingston's online compatibility tool with your exact server model and OEM part number to confirm supported speeds before deployment. The module's registered buffer is compatible with RDIMM-only slots; it will not operate in UDIMM-only or LRDIMM-only slots. The KSM56R46BS8-16HA (often searched as KSM56R46BS8 16HA) is a factory-new, genuine Kingston module sourced through standard commercial supply channels.

Frequently Asked Questions

Q: Is the KSM56R46BS8-16HA a Registered (Buffered) or Unbuffered DIMM?

A: It is a Registered (Buffered) RDIMM. It requires a server motherboard with RDIMM-compatible DDR5 slots. It will not operate in platforms that only support UDIMMs or LRDIMMs.

Q: What IC manufacturer is used in the KSM56R46BS8-16HA?

A: The module uses Hynix A-die ICs, as indicated by the "HA" suffix in the part number. This is a factory-specified IC source, not a field-substituted component.

Q: Does this module support On-Die ECC in addition to standard ECC?

A: Yes. DDR5 mandates On-Die ECC (ODECC) at the chip level. The KSM56R46BS8-16HA includes ODECC, meaning each Hynix A-die corrects single-bit errors internally. The module also supports host-side ECC via the registered buffer interface, providing two independent error-correction layers.

Q: Will this DDR5 module work in a DDR4 server?

A: No. DDR5 and DDR4 use different 288-pin connectors with different keying. They are physically and electrically incompatible. Your server motherboard must explicitly support DDR5 RDIMMs.

Q: What is the operating voltage of the KSM56R46BS8-16HA?

A: 1.1V. This is the JEDEC-standard DDR5 operating voltage, lower than the 1.2V typical for DDR4, contributing to reduced power consumption in fully populated server configurations.

Q: Does the KSM56R46BS8-16HA include an SPD profile?

A: Yes. The module ships with a programmed SPD profile, allowing the server BIOS/UEFI to automatically configure correct speed, timings, and voltage at POST without manual intervention — important for server platforms enforcing JEDEC RAS initialization standards.

Marty Allison

When I spec server memory for high-availability deployments, the KSM56R46BS8-16HA stands out specifically because it carries both On-Die ECC at the Hynix A-die level and host-side ECC through the registered buffer — two independent error-correction layers in a single 16GB DDR5 DIMM running at 5600 MT/s. That dual-ECC architecture is not universal even among DDR5 RDIMMs, and for 24/7 server workloads it represents a genuine reliability advantage over single-layer correction designs.

Technical Highlights:

• 5600 MT/s DDR5 Bandwidth: Roughly 44.8 GB/s peak per channel at 5600 MT/s — a meaningful step up from DDR4-3200's ~25.6 GB/s. For NVR backend servers ingesting multiple high-resolution streams simultaneously, or analytics servers processing concurrent AI inference jobs, the added bandwidth headroom directly reduces memory bottleneck risk.
• CL46 / 48ns Row Cycle Time: At 5600 MT/s, CL46 translates to an absolute latency of approximately 16.4ns — competitive for a DDR5 RDIMM at this speed grade. The 32ns row active time and 16-tick row precharge keep random-access penalty manageable for mixed read/write server workloads.
• 1.1V Operating Voltage: In a 16-DIMM fully populated 2-socket chassis, the 0.1V reduction versus DDR4 (1.2V) cuts per-module thermal output measurably. In thermally constrained 1U/2U rack deployments, that delta matters for sustained all-day workloads without throttling.

Deployment Considerations:

• Confirm your server platform's Memory Qualification List (MQL/QVL) for DDR5-5600 RDIMM support before ordering. Some DDR5 platforms validate only up to DDR5-4800 or DDR5-5200 on the first DIMM per channel, and will train down automatically — you won't get a boot error, just lower-than-spec bandwidth.
• Single-rank 1Rx8 modules cannot be mixed with dual-rank modules (2Rx4 or 2Rx8) in the same memory channel without risking platform-enforced speed downgrades. If you're populating a channel incrementally, plan the rank topology upfront — retrofitting is disruptive on production systems.

The KSM56R46BS8-16HA is the right fit for a DDR5-capable server build where reliability and dual-layer ECC are non-negotiable — particularly NVR appliances, surveillance analytics servers, or virtualization hosts running mission-critical security workloads around the clock.