HPE 829806-091 32GB DDR4-2400 Dual Rank ECC Registered Memory Module.

HPE 829806-091 32GB DDR4-2400 RDIMM 

HPE 829806-091 32GB DDR4-2400/PC4-19200 RDIMM CL17 Dual Rank x4 ECC Registered 288-Pin Memory Module is a purpose-built server memory product designed for enterprise-grade reliability, data integrity, and consistent performance in HPE ProLiant and select industry-standard servers. This module targets data centers, virtualization hosts, database servers, high-performance computing nodes, and other mission-critical environments where error-correcting code (ECC) functionality, registered buffering, and server-certified compatibility are required.

Technical specifications explained

Memory density and form factor

The module offers 32 gigabytes (GB) of capacity per DIMM — a commonly preferred size for balancing density and memory channel population in dual-processor (2P) and quad-processor (4P) servers. As a 288-pin Registered DIMM (RDIMM), the physical interface conforms to the JEDEC standard for DDR4 registered modules and is compatible with server sockets designed for 288-pin DDR4 memory.

Speed and latency details

Operating at DDR4-2400 (also marketed as PC4-19200), this module transfers data at a peak theoretical bandwidth of 19.2 GB/s per module when running in single-channel equivalent conditions. The CAS latency of CL17 describes the column access strobe timing — an important metric when comparing responsiveness between memory options at similar frequencies. For workloads sensitive to both throughput and latency (virtualized databases, in-memory caches), DDR4-2400 with CL17 represents a solid balance.

Rank, bus width, and ECC

Dual Rank x4 configuration indicates there are two ranks (logical sets of DRAM chips) on the module and a x4 data organization per DRAM chip. The RDIMM registration combined with ECC (Error-Correcting Code) provides improved signal integrity and automatic single-bit error correction with multi-bit error detection — essential for mission-critical server operations where data corruption is unacceptable.

Power and thermal characteristics

DDR4 RDIMMs typically operate at 1.2V nominal voltage. While exact power draw depends on system population and operational workload, choosing server-class RDIMMs helps ensure predictable thermal behavior and compatibility with server thermal management policies. HPE-certified modules like the 829806-091 are manufactured and tested to meet HPE's power/thermal thresholds for supported platforms.

Compatibility and certified platforms

HPE ProLiant and blade systems

This module is primarily intended for HPE ProLiant Gen9/Gen10 servers and compatible blade chassis, where HPE part numbers and memory platforms are closely matched to system BIOS and firmware to provide validation of speed, timing, and error reporting. When searching for replacements or upgrades, use vendor compatibility matrices and HPE QuickSpecs to confirm platform support.

Mixing modules and population guidance

Best practice for capacity expansion is to populate memory channels symmetrically — matching capacity, rank, and speed across channels and CPU sockets whenever feasible. Mixing RDIMM and LRDIMM or mixing different speeds can force the system to downclock memory to the slowest installed module or in some cases may not be supported. For optimal results, pair 32GB DDR4-2400 RDIMMs in matched sets where possible.

Supported topologies

• Single-CPU systems: populate recommended DIMM slots per vendor guidance to enable maximum memory channels.
• Dual-CPU systems: distribute identical DIMMs across both processors to enable balanced bandwidth and NUMA-friendly allocation.
• High-density configurations: when building high-memory servers, confirm total system memory limits per CPU and motherboard.

Performance use cases and workload suitability

Virtualization and cloud infrastructure

Virtual machine density relies heavily on memory capacity and predictable latency. 32GB modules allow administrators to provision more RAM per slot, enabling either higher VM counts or larger memory allocations per VM while keeping DIMM population and slot usage manageable. ECC protection reduces the risk of memory-induced VM crashes or silent data corruption.

Databases and in-memory caches

Relational databases and in-memory stores (e.g., Redis, memcached) benefit from higher capacity per DIMM. DDR4-2400 provides sufficient throughput for mid-to-large datasets while ECC ensures data integrity for transactions and cached objects that must not be corrupted.

High-performance computing (HPC) and analytics

Compute clusters and analytics nodes that perform large-memory operations or hold working sets in memory will see advantages from server-certified RDIMMs. While absolute memory bandwidth is important, reliability and error correction are often the deciding factors in selecting RDIMM modules for HPC nodes.

Subcategories and related product families

Other capacities and speed variants

This category commonly sits alongside related modules such as 8GB, 16GB, 64GB, and 128GB RDIMMs in various speed grades (DDR4-2133, DDR4-2400, DDR4-2666). Buyers frequently compare capacity-per-slot tradeoffs and select the mix that best meets performance, density, and budget requirements.

LRDIMM vs RDIMM considerations

Load-Reduced DIMMs (LRDIMMs) allow higher per-slot capacities by further isolating the electrical load on the memory bus, but they differ electrically from RDIMMs. Systems usually do not support mixing RDIMMs and LRDIMMs; choose the family that best aligns with your capacity goals and platform compatibility.

Consumer and desktop memory (for clarity)

Server RDIMMs are distinct from consumer DDR4 UDIMM modules — they include registered chips and ECC features absent in desktop memory. When purchasing memory for servers, specifically filter for "RDIMM" and check ECC capabilities; installing a UDIMM in a server expecting RDIMM may cause incompatibility or suboptimal behavior.

Comparisons, alternatives, and upgrade paths

Upgrade from 16GB to 32GB modules

Upgrading from 16GB to 32GB per slot doubles capacity while reducing the number of occupied slots for a target memory size. This can improve channel layout flexibility and lower the number of DIMMs required for future expansions.

Choosing between DDR4-2133, DDR4-2400, and DDR4-2666

Higher frequency modules (e.g., DDR4-2666) deliver more bandwidth but must be supported by the server's memory controller and firmware. DDR4-2400 is a balanced choice for many HPE platforms, offering stability and compatibility across numerous ProLiant generations.