HPE P14398-B21 16GB DDR4-3200 2RX4 CAS-22-22-22 PC4-25600 RDIMM Dual-rank Memory.

• This category centers on the HPE SKU P14398-B21, a 16GB DDR4 registered memory module with the following short-form attributes:
• Capacity: 16GB
• Memory Type: DDR4 RDIMM (Registered DIMM)
• Speed / Data Rate: DDR4-3200 (PC4-25600)
• Rank / Organization: 2Rx4 (Dual-rank x4 organization)
• CAS Latency: CL22 (22-22-22 timing)
• Form Factor: 288-pin DIMM
• Voltage: Standard DDR4 voltage (typically 1.2V)
• Target Platforms: HPE ProLiant servers and compatible enterprise systems

P14398-B21 HPE 16GB DDR4-3200 2RX4 CAS-22-22-22 PC4-25600 RDIMM

The P14398-B21 HPE 16GB DDR4-3200 2RX4 CAS-22-22-22 PC4-25600 RDIMM category groups enterprise-grade registered DIMM memory modules engineered for Hewlett Packard Enterprise (HPE) servers and certified platforms. This category description focuses on the technical profile, architecture, performance characteristics, compatibility considerations, use cases, procurement guidance, installation and maintenance best practices, and frequently asked questions tailored for system administrators, data center managers, procurement teams, and resellers.

Technical Breakdown

Memory Architecture: 2Rx4 Explained

The designation 2Rx4 indicates a dual-rank module where each rank is built from x4 DRAM chips. A rank is effectively a set of DRAM chips that the memory controller can access independently. Dual-rank modules present two ranks to the controller which can improve throughput in some configurations, at the cost of additional electrical loading compared with single-rank parts. The x4 organization means each DRAM chip contributes 4-bit data paths—common in server-grade modules where ECC (error-correcting code) and advanced organization benefit reliability and error handling.

Speed & Timing: DDR4-3200 and CAS 22

DDR4-3200 (often referenced by JEDEC as PC4-25600) runs with a theoretical peak bandwidth of 25,600 MB/s per module at peak transfer rates. CAS latency (Column Address Strobe) of 22 is one of the timing parameters indicating how many clock cycles pass between the memory controller issuing a read command and the module returning the requested data. While lower CAS numbers appear faster in isolation, practical throughput is a combination of timings, memory frequency, rank and channel interleaving, and the specific workload’s access pattern.

Compatibility & Validation

HPE Platform Certification and Firmware Considerations

Modules in the P14398-B21 category are designed and validated for specific HPE ProLiant models and other HPE server chassis. When planning upgrades or replacements, always consult the server’s memory population guidelines in the HPE Quick Specs and firmware (BIOS/UEFI) release notes to ensure. Supported operating speeds (some platforms may default to lower speeds depending on CPU and population). Maximum supported capacity per slot and per socket. Firmware advisories for mixed-memory scenarios (mixing ranks, different vendors, or different speeds).

CPU and Chipset Interactions

Memory speed and effective performance depend on the installed CPU and chipset. Many server CPUs have memory controllers that support DDR4-3200 under specific conditions (certain cores, channel populations, or single/dual-rank limitations). Check the CPU datasheet and HPE platform notes to understand whether full DDR4-3200 operation requires.

Latency vs. Bandwidth: Practical Considerations

While CL22 indicates a higher latency number than some lower-capacity consumer DIMMs, the overall bandwidth and multi-rank interleave offset raw latency differences for many server tasks. For parallel workloads that stream large amounts of data, higher bandwidth and larger capacity are typically more valuable than marginal latency improvements.

Data Integrity and Regulatory Requirements

For organizations under strict regulatory standards (financial, healthcare, government), certified RDIMMs can help meet requirements for data integrity and auditability. ECC and vendor-validated DIMMs reduce the likelihood of data errors that could trigger compliance incidents.

PC4-25600

Industry shorthand indicating a peak theoretical transfer rate of ~25,600 MB/s for DDR4-3200 modules.

RDIMM (Registered DIMM)

Memory modules that include a register to buffer address/command signals—improves stability in multi-DIMM server environments.

2Rx4 (Dual-Rank x4)

A module organization describing two ranks comprised of chips with a 4-bit data width per chip.

CAS Latency (CL)

The number of clock cycles between a READ command and the moment data is available from the module.