876319-V81 HPE 8GB 2666mhz PC4-21300 ECC Reg DDR4 SDRAM 288-Pin Memory

HPE 876319-V81 8GB Memory Overview

The HPE 876319-V81 is a server-grade 8GB DDR4 memory module engineered for reliability, throughput, and predictable behavior under continuous load. Built as a registered, error-correcting memory module in the RDIMM form factor, this module operates at DDR4-2666 (PC4-21300) speeds and follows industry electrical and mechanical standards for 288-pin server DIMMs. It is manufactured to serve as a drop-in upgrade or replacement for compatible HPE ProLiant systems and a wide selection of enterprise server platforms that accept registered ECC memory. The combination of 8 gigabytes of capacity, registered buffering, ECC protection, and the 2666 MHz data rate positions the 876319-V81 as a compelling balance between cost, density, and performance for mainstream server workloads.

Core Specifications

The capacity is 8GB per module, providing a useful building block for scaling memory in increments that favor large DIMM counts across multi-socket servers. The operating frequency is 2666 MHz (often referenced as DDR4-2666 or PC4-21300), which represents the peak module data transfer rate under JEDEC timing and voltage conditions; this frequency is widely supported by modern Intel and AMD server platforms within the ProLiant family and many certified server motherboards. The module is built as a registered (buffered) DIMM with ECC (Error Correction Code) to detect and correct single-bit errors and detect multi-bit errors, increasing system resilience for long uptimes and mission-critical applications. Physically, the module conforms to the 288-pin DDR4 RDIMM standard with a 1.2V nominal operating voltage, low power draw relative to older generations, and typical DDR4 timing characteristics (CL19 in common retail listings for the part), making it a straightforward match for systems expecting CL19 latency at 2666 MHz.

Registered ECC

Registered ECC modules insert a register between the system memory controller and the DRAM chips. That register reduces electrical load on the memory bus when multiple modules are populated, enabling higher DIMM counts and more stable operation across many channels and ranks. The ECC functionality provides automatic single-bit error correction, dramatically reducing the risk of silent data corruption — a non-negotiable feature for database servers, virtualization hosts, file servers, and any environment where data integrity is a priority. For administrators, using RDIMM ECC modules like the 876319-V81 means lower risk of memory-related crashes, fewer unplanned reboots, and better compatibility with enterprise firmware and firmware monitoring systems.

Form Factor

The HPE 876319-V81 is a dual-rank module commonly listed as 2Rx8, indicating two logical ranks of memory and an x8 device organization. Dual-rank modules provide a balance of density and parallelism that can improve effective throughput in certain memory controller designs while keeping per-module capacity cost effective. The 288-pin edge connector conforms to the DDR4 RDIMM mechanical standard, meaning the module will physically fit any DDR4 288-pin RDIMM slot but still requires BIOS/Firmware and HPE platform support to be fully validated. In many server configurations, mixing ranks, capacities, or registered vs. unregistered modules can cause the system to fall back to safe speeds or disable certain performance optimizations, so observing vendor compatibility lists is recommended when populating large memory arrays.

Timing

Typical retail and OEM references show the 876319-V81 rated to run at 2666 MT/s with CAS latency commonly reported as CL19; operating voltage is the standard DDR4 1.2V. These electrical and timing parameters allow the module to sit within expected thermal envelopes for modern server DIMM channels while delivering stable timing at the published speed when used in supported configurations. Because server systems vary in airflow, ambient temperature, and operational load, thermal management should be considered as part of any upgrade plan: ensure proper airflow and that the server chassis fan profiles are configured to keep DIMM temperatures within manufacturer-recommended operating ranges, particularly in densely populated or blade environments.

Compatibility

Compatibility for server memory is governed by more than the physical form factor. HPE validates specific part numbers against server families and BIOS/firmware revisions; installers should consult HPE’s compatibility matrix and release notes when planning upgrades. Although the module’s electrical specification (DDR4-2666, RDIMM, ECC, 288-pin) makes it broadly compatible with platforms that accept registered DDR4 memory, actual support may vary by server generation, CPU family, and existing memory population. In practice, the 876319-V81 is frequently listed or sold as compatible with a wide set of ProLiant Gen9/Gen10 servers and successor systems that accept PC4-21300 registered ECC modules, making it a commonly chosen option for scaling memory in enterprise racks, hyperconverged nodes, and entry-to-midrange virtualization hosts. Always cross-reference the HPE part number with your server’s qualified spare or supported memory list to ensure firmware will enumerate and initialize the module at full performance.

Mixing modules

Memory mixing rules differ between platforms and are enforced at the firmware level. If you install 876319-V81 modules alongside other DIMMs of different speeds or ranks, the memory controller may down-clock all modules to the lowest common speed or impose restrictions on channel population to preserve stability. For predictable performance, populate channels with identical modules in matched pairs according to the server vendor’s guidance. When expanding memory, prioritize identical HPE part numbers where possible to simplify troubleshooting, firmware compatibility.

Firmware

Each module contains SPD (Serial Presence Detect) data that communicates timing, voltage, and part identifiers to the host system during power-on. Modern HPE servers will read SPD and, when allowed by the firmware setting, automatically set optimal timings and voltages for the installed DIMMs. However, firmware or BIOS updates often include memory compatibility and optimization improvements; as such, keeping server firmware current is a straightforward way to increase the likelihood that a given memory part will be recognized and run at advertised speed and timings.

Performance

The 2666 MT/s native data rate situates the 876319-V81 squarely in the mainstream performance tier for DDR4 server memory. For workloads that rely heavily on memory bandwidth — such as in-memory analytics, large VM density hypervisors, and high throughput database caches — higher frequency modules or configurations with wider channels may offer measurable gains. However, for many business applications, web servers, traditional SQL workloads, and mixed virtualization environments, the balance of cost and latency delivered by an 8GB, CL19, 2666 MHz RDIMM is often the optimal choice. Because this part is ECC registered, it trades off a small amount of additional latency for stability and higher DIMM counts, a trade-off that is usually acceptable and desired in clustered and enterprise contexts.

Latency

Memory performance is a function of both raw bandwidth (data rate) and latency (CAS and related timings). While higher speed modules push more data per clock, CAS latency and the memory controller’s handling of ranks and channels influence the real latency seen by applications. Dual-rank modules like the 876319-V81 sometimes show slight latency differences compared to single-rank modules because of the additional rank switching, yet they can also provide improved parallelism under certain workloads. System architects should evaluate the memory performance profile in representative testing environments — real application benchmarks will reveal whether raw frequency or rank/parallelism advantages make a measurable difference for a given workload.

Use Cases

The 876319-V81 is a strong fit for a set of common enterprise use cases. Virtualization hosts running numerous small-to-medium VMs benefit from predictable capacity expansion using 8GB modules to reach desired totals without excessive cost per DIMM. Database systems that prioritize data integrity will leverage the ECC capability to guard against data corruption. Entry-level storage controllers, backup appliances, and management nodes in clustered environments also value the stability of registered ECC memory. For lab and testbed servers, the availability and affordability of the module make it ideal for building homogeneous test clusters that mirror production memory configurations.

Reliability

When deploying memory at scale in enterprise environments, the cost of occasional failures or silent errors can be significant. ECC RDIMM modules like the 876319-V81 mitigate single-bit errors automatically and provide system event logging that administrators can monitor via iLO or similar management interfaces. Proactive monitoring for corrected errors, uncorrectable errors, and DIMM health can reveal failing modules early and prevent data loss or unplanned downtime.