P19046-B21 HPE 128GB PC4-23400 DDR4 2933MHz Rank LRDIMM Memory Module

HPE P19046-B21 128GB DDR4 Smart Memory Kit Overview

The HPE P19046-B21 128GB DDR4 Load Reduced Smart Memory Kit is designed for enterprise-grade servers, delivering outstanding speed, stability, and scalability. Optimized for HPE ProLiant Gen10 servers, this advanced RAM module ensures dependable performance for workloads that demand high-capacity memory and low latency.

Key Technical Specifications

• Manufacturer: HPE
• Part Number: P19046-B21
• Module Type: DDR4 SDRAM – 288-pin DIMM
• Storage Capacity: 128GB (1 x 128GB module)
• Speed: 2933 MT/s (PC4-23400)
• Features: Octal Rank x4, Load Reduced DIMM (LRDIMM)
• Voltage: 1.2V
• CAS Latency: 24-21-21
• Form Factor Dimensions: 8.89 x 19.05 x 1.91 cm

Performance Advantages of HPE Smart Memory

Performance Advantages of HPE Smart Memory

Benefits at a Glance

• Boosts data center productivity with high-speed bandwidth
• Ensures maximum uptime through advanced reliability testing
• Supports larger virtualization environments seamlessly
• Reduces power consumption while maintaining performance
• Engineered for optimal compatibility with HPE ProLiant servers

HPE Server Models

• HPE ProLiant BL460c Gen10 Blade Servers
• HPE ProLiant DL180, DL360, DL380, DL388 Gen10
• HPE ProLiant DX170r, DX360, DX380, DX560 Gen10
• HPE ProLiant DL560, DL580 Gen10
• HPE ProLiant ML350 Gen10
• HPE Synergy 480 and 660 Compute Modules
• HPE ProLiant XL230k
• HPE Apollo 2000 XL170r, XL190r, Apollo 4200, Apollo 4500 XL450, Apollo 6500

LRDIMM Highlights

• Enables higher memory density without performance bottlenecks
• Offers more stability in multi-channel memory configurations
• Optimized for compute-intensive server applications
• Ensures efficient cooling and lower thermal output

Use Cases

• Large-scale virtualization and cloud infrastructure
• High-performance databases and data analytics
• Enterprise-level ERP and CRM applications
• Artificial Intelligence (AI) and Machine Learning (ML) workloads
• Mission-critical enterprise workloads demanding reliability

P19046-B21 HPE 128GB DDR4 PC4-23400 (2933MHz) LRDIMM Category Overview

The P19046-B21 HPE 128GB DDR4 PC4-23400 memory module is a high-density, low-latency registered dual in-line memory module built to serve modern enterprise-class HPE servers and platforms. Marketed under HPE part number P19046-B21, this module offers 128 gigabytes of capacity per module, DDR4 architecture, a peak transfer specification commonly referenced as PC4-23400, and an operating clock rate of 2933MHz. Designed as a Load-Reduced DIMM (LRDIMM), it targets workloads demanding substantial memory capacity and consistent throughput — especially virtualization, large in-memory databases, analytics platforms, high-performance computing (HPC) tasks, and scale-out enterprise installations.

Makes the P19046-B21 category distinct

The defining attributes of this product family are capacity, frequency, and LRDIMM technology. A 128GB module is considered high-capacity in the server market and enables dense memory configurations with fewer DIMM slots used — translating into lower overall system complexity and higher available memory headroom per chassis. The PC4-23400 designation indicates theoretical peak bandwidth aligned with DDR4-2933 signaling, which balances bandwidth and latency for a broad range of server-class applications. Being an LRDIMM, these modules incorporate buffer chips that reduce electrical load on the memory bus, allowing many high-capacity modules to operate simultaneously without causing signal integrity issues or instability typically associated with high-density populating.

Memory Technologies Explained LRDIMM

In server memory categories, three common DIMM types appear: UDIMM (unbuffered), RDIMM (registered) and LRDIMM (load-reduced). LRDIMMs are engineered to reduce electrical load on the memory channel via an on-module buffer (often a buffer or isolation chip) — enabling much higher memory capacities per channel and per system without degrading signal integrity. For large-scale memory deployments, LRDIMM shines because. LRDIMMs trade off some additional module latency caused by the buffer versus the benefit of enabling more memory. For applications where capacity and uptime outrank a few nanoseconds of extra latency, LRDIMM is the preferred choice.

Rank and Buffering: How they matter for P19046-B21

A module's rank describes how its memory chips are grouped logically — single-rank, dual-rank, quad-rank are typical. The P19046-B21 128GB LRDIMM commonly appears in multi-rank configurations because high-capacity modules must present multiple logical banks to the controller. The load-reduced buffer separates the rank presentation from the electrical load on the channel, meaning that even quad-rank logical devices can be supported without the channel experiencing the loading penalty. When designing or expanding server memory with P19046-B21 modules.

Compatibility & Platforms

Although branded HPE modules like P19046-B21 are optimized for HPE ProLiant and similar enterprise servers, compatibility must be validated case-by-case. The most important compatibility vectors are. When shopping for P19046-B21 modules, buyers frequently cross-reference HPE server compatibility matrices and use HPE’s system configuration tools to verify validated combinations. This reduces the risk of unsupported installations and ensures optimal performance.

Performance Characteristics Bandwidth, Latency, and Real-World Impact

Performance with the P19046-B21 series is driven by clock speed, memory timings, module buffering, and the server's memory controller architecture. DDR4-2933 nominally provides higher bandwidth compared with lower frequency parts (e.g., DDR4-2400 or DDR4-2666), but actual in-application gains depend on workload memory access patterns, concurrency, and CPU architecture. Typical performance considerations include.

How to populate DIMM slots

Follow HPE’s memory population order: fill recommended slots per channel first, distribute memory evenly across channels and sockets to maintain interleaving, and avoid mixing LRDIMM and RDIMM types. In many HPE systems, population order matters for enabling full-speed operation and for balanced latency/performance across channels.

Handling mixed speeds or legacy DIMMs

If the system contains existing DIMMs of a lower speed or different rank, the memory controller will typically run all modules at the speed of the slowest installed DIMM. To preserve DDR4-2933 operation, install matched modules or ensure the controller’s supported mixed-speed behavior is acceptable for your performance needs.

Use Cases & Ideal Applications

The P19046-B21 128GB LRDIMM is tailored to environments where large memory footprints are required and memory density drives the solution architecture. Representative use cases include. OLTP and OLAP workloads where buffer pool sizes and cache residency directly influence transaction throughput.

Architectural scenarios

System architects often choose 128GB LRDIMM modules to reduce total DIMM count while increasing maximum per-socket memory. For example, an 8-slot memory channel populated with eight 128GB modules yields a much higher capacity than using 32GB modules across the same slots — simplifying maintenance and potentially lowering per-server power draw and heat per gigabyte stored.

Documentation & Resources to consult

Before deployment, consult authoritative resources:

• Server-specific memory population and configuration guides
• HPE part number cross-reference documentation
• Release notes for BIOS and firmware updates addressing memory compatibility
• Datasheets for the exact P19046-B21 module

Meta-focused copy suggestions (for on-page use)

Use concise meta descriptions and title tags that include the part number, capacity, speed, and module type. Example patterns. Compatibility depends on your server model and CPU generation. Always check the server's memory compatibility matrix or the HPE Quick Specs for validated memory modules and supported maximum capacities. If in doubt, consult the vendor or an HPE-certified reseller with your exact server part number and BIOS version.

Many P19046-B21 modules can I install per CPU socket

The maximum number depends on the server platform’s DIMM slot count and whether it supports LRDIMM population in every slot. Check your server’s maximum memory per socket and recommended population guide. Genuine HPE modules typically include manufacturer warranty coverage; third-party sellers vary. Confirm warranty length and RMA procedure with the seller before purchase.

Choosing between RDIMM and LRDIMM

Choose RDIMM when your platform needs registered ECC memory but does not require extreme per-socket capacity. Choose LRDIMM when you prioritize maximum memory capacity and system scalability. Always consult your server’s validated memory list to make an informed choice.

Considerations (technical buyers checklist)

Confirm server model, CPU generation, and firmware compatibility for DDR4-2933 and 128GB LRDIMM support. Verify whether your workload benefits more from additional memory capacity or from slightly lower latency; choose LRDIMM or RDIMM accordingly. Ensure BIOS/UEFI firmware is up to date for large-memory support and stable operation. Buy from authorized channels to preserve warranty and avoid counterfeit risks. Plan deployment during maintenance windows and validate with stress testing and monitoring after installation. The P19046-B21 HPE 128GB DDR4 PC4-23400 LRDIMM category is a strategic choice for organizations that require dense memory capacity for virtualization, in-memory analytics, and enterprise-class applications. When selected and installed with attention to server compatibility and population rules, these modules enable significant memory expansion with enterprise-grade reliability and the error protection required in mission-critical environments.