Kingston KSM56R46BS4PMI-48HMI 48GB 5600MT/S DDR5 ECC REG CL46

Kingston KSM56R46BS4PMI-48HMI 48GB DDR5-5600 ECC Registered Server Memory

Overview

The Kingston KSM56R46BS4PMI-48HMI is a 48GB single-rank DDR5 ECC Registered DIMM running at 5600 MT/s — purpose-built for server and workstation platforms that demand both high bandwidth and memory integrity. At CL46 and 1.1V operating voltage, this module hits the DDR5 performance tier where modern server platforms live, while the registered (buffered) design and on-die ECC provide the reliability that 24/7 infrastructure workloads require. If you're provisioning memory for dense compute nodes, NVR servers, or enterprise storage platforms where a single bit flip could mean a corrupted recording or a silent data error, this is the class of module you need.

Key Features

• 5600 MT/s Transfer Rate: DDR5-5600 delivers roughly double the peak bandwidth of DDR4-3200 — meaningful when your server CPU is streaming video frames, processing analytics, or running parallel database queries. Bandwidth-bound workloads (AI inference, video transcoding, real-time surveillance analytics) will see the difference versus slower DDR5 bins.
• 48GB Single-Module Capacity: The 1×48GB layout (single DIMM, single rank) lets you populate a platform incrementally — start with one module per channel and add capacity later without having to swap out DIMMs. For platforms with 8 or 12 DIMM slots, this gets you to 384GB or 576GB fully populated without going to dual-rank density, keeping per-channel timing cleaner.
• On-Die ECC (ODECC): DDR5 introduces on-die ECC at the DRAM die level — separate from and in addition to the system-level ECC this module also supports. ODECC silently corrects single-bit errors inside the DRAM device itself before the memory controller ever sees them. In high-density configurations, this matters: more DRAM dies per channel means more exposure to soft errors, and ODECC is the first line of defense.
• Registered (Buffered) Design: The register buffer on this DIMM re-drives the command and address signals, reducing the electrical load on the memory controller. That's what makes it possible to populate multiple DIMMs per channel without signal integrity problems — something unbuffered (UDIMM) designs can't safely do at scale. If your platform specifies RDIMM, this is the correct module type; installing a UDIMM in an RDIMM slot will either fail POST or cause stability issues.
• CL46 / 1.1V Operating Point: CAS latency 46 at 5600 MT/s works out to an absolute latency around 16ns — competitive for DDR5 at this speed grade. The 1.1V supply voltage is standard for DDR5 (versus DDR4's 1.2V), which matters if your platform has tight power budgeting across a fully populated 24-DIMM configuration.
• Single Memory Rank: Single-rank modules generally give better compatibility across a wider range of server platforms and BIOS revisions, particularly when mixing with other DIMMs. If your QVL (qualified vendor list) shows rank sensitivity, single-rank is the safer starting point.
• SPD Profile Included: The module carries a programmed SPD (Serial Presence Detect) profile, which means the server's BIOS can read the correct timing parameters automatically at boot. No manual BIOS overrides needed — the platform will configure the correct CL46 timings, row cycle time (48ns tRC), and row precharge (TRP 16) without intervention.
• 288-Pin DIMM Form Factor: Standard DDR5 288-pin desktop/server form factor. Verify your platform's DIMM slot spec — DDR5 288-pin is not backward-compatible with DDR4 slots despite the same physical pin count on older generations.

Integration and Compatibility

The KSM56R46BS4PMI-48HMI is designed for server-class platforms specifying DDR5 ECC Registered DIMMs at the DDR5-5600 speed grade. Before ordering, confirm three things against your platform's QVL: (1) the platform supports DDR5 RDIMM (not LRDIMM or UDIMM), (2) the platform supports 5600 MT/s in your target slot configuration (some platforms downclock at higher population densities), and (3) the 48GB per-DIMM density is on the QVL — some older DDR5 server platforms qualified only 16GB and 32GB densities at launch. The 1.1V VDD and 1.8V VPP are standard DDR5 rails; any DDR5-capable server platform will supply these. The module's single-rank design (1 rank × 48GB) should be cross-referenced against your platform's rank-mixing rules if you're installing alongside other DIMMs already in the system. For surveillance server builds, pair this with a platform validated for your NVR software's memory requirements — many enterprise VMS vendors publish minimum RAM specifications per camera channel count, and 48GB per DIMM gives meaningful headroom for high-channel-count deployments running edge analytics simultaneously.

Frequently Asked Questions

Q: What is the difference between on-die ECC and system ECC on the KSM56R46BS4PMI-48HMI?

A: The KSM56R46BS4PMI-48HMI supports both. On-die ECC (ODECC) operates inside each DRAM die and corrects single-bit errors before data ever leaves the chip — it is transparent to the memory controller and always active. System-level ECC (supported via the registered/ECC design of the module) operates across the full data path between the DIMM and the memory controller, catching and correcting errors that ODECC does not handle. Both layers are active simultaneously in a compatible ECC server platform.

Q: Is the KSM56R46BS4PMI-48HMI compatible with consumer desktop motherboards?

A: No. This is a registered (buffered) ECC DIMM, which requires a server or workstation platform with a memory controller that supports RDIMMs. Consumer desktop platforms — even those with DDR5 slots — exclusively support unbuffered non-ECC (UDIMM) or unbuffered ECC (ECC UDIMM) modules. Installing an RDIMM in a consumer desktop will result in a POST failure or no-boot condition.

Q: Will this module run at 5600 MT/s in all slot configurations?

A: Not necessarily. Many server platforms reduce the effective memory bus speed when more DIMMs are populated per channel (a behavior known as downclocking or gear-down mode). Check your platform's memory configuration guide — it will typically show the maximum supported speed at 1 DIMM per channel (1DPC) versus 2 DIMMs per channel (2DPC). The 5600 MT/s rating is the module's qualified maximum speed; actual operating speed is determined by the platform BIOS and population configuration.

Q: What is the operating voltage of the KSM56R46BS4PMI-48HMI, and does it require a special power supply?

A: The module operates at 1.1V VDD (core supply) and 1.8V VPP (programming power voltage). Both are standard DDR5 rails provided by any DDR5-capable server motherboard. No external or supplemental power supply is required beyond what the platform already delivers to the DIMM slot.

Q: Is the KSM56R46BS4PMI-48HMI a single-rank or dual-rank module?

A: Single-rank (1 rank, 48GB total capacity per module). Single-rank modules typically offer the broadest platform compatibility and the fewest rank-mixing constraints when populating multiple DIMMs per channel. If your platform's QVL lists both single-rank and dual-rank options at this density, single-rank is generally the lower-risk choice for initial deployment.

Q: What row cycle and precharge timings does the KSM56R46BS4PMI-48HMI use?

A: The SPD profile on this module encodes a row cycle time (tRC) of 48ns, a refresh row cycle time (tRFC) of 295ns, a row active time (tRAS) of 32ns, and a row precharge time (tRP) of 16 clock cycles. These are loaded automatically from the SPD at boot — no manual BIOS timing configuration is required on a compliant DDR5 server platform.

Karl Wilson

The KSM56R46BS4PMI-48HMI sits at an interesting intersection in the DDR5 server memory space: the 48GB density per module is notably more efficient than stacking two 32GB DIMMs for the same capacity, and the single-rank design means you're not fighting rank-multiplicity penalties when the platform calculates its maximum supported speed. For a senior integrator specifying memory for a high-channel-count NVR server or a compute node running real-time video analytics, the 5600 MT/s bandwidth ceiling matters — sustained video ingest plus parallel metadata indexing is a genuinely bandwidth-hungry workload, and this module's DDR5-5600 rating gives you headroom that DDR5-4800 modules at the same density do not.

Technical Highlights:

• Dual-Layer ECC Architecture: On-die ECC at the DRAM die level plus system-level ECC across the full data bus — in a 48GB high-density module with more dies per rank, both correction layers matter for long-running server uptime.
• 48ns tRC / 295ns tRFC: The refresh row cycle time of 295ns reflects the higher refresh overhead at 48GB density; platforms with aggressive memory scheduling need to account for this in their memory controller configuration, particularly under sustained high-bandwidth loads.
• 1.1V / 1.8V VDD+VPP: Standard DDR5 supply rails mean no platform-specific power delivery concerns — straightforward to specify across any DDR5 RDIMM-capable server SKU without checking exotic voltage requirements.

Deployment Considerations:

• Always verify the 48GB density is explicitly listed on your target platform's QVL — DDR5 RDIMMs launched with 16GB and 32GB qualification tiers on many platforms, and 48GB density support was added in later BIOS revisions. A module not on the QVL may boot but can exhibit intermittent errors under load.
• Single-rank at 48GB means this module uses higher-density DRAM dies than a dual-rank 32GB module — check your platform's per-channel density ceiling, not just its per-DIMM slot count, before specifying a fully-populated configuration.

Best deployment fit: multi-socket compute nodes or NVR server builds targeting 192GB–384GB total system memory where per-channel capacity matters more than minimizing DIMM count, and where the platform's DDR5-5600 speed grade is validated at 1DPC to ensure full bandwidth is actually realized.