HPE 128GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin Load Reduced DIMM 1.2V Octal Rank x4 Memory Module – 840760-091

HPE 840760-091 128GB DDR4-2666 ECC LRDIMM — 8Rx4 Server Memory

The HPE 840760-091 is a 128GB DDR4-2666 ECC Load Reduced DIMM providing octal-rank x4 server memory for HPE ProLiant Gen10 servers — delivering maximum DDR4 density per slot with LRDIMM load reduction for ultra-high memory capacity configurations in HPE multi-socket server platforms supporting SAP HANA, in-memory analytics, and large-scale virtualization workloads.

Key Features

• 128GB DDR4-2666 ECC LRDIMM — 8Rx4 octal-rank for maximum DDR4 capacity per DIMM slot
• LRDIMM architecture with data buffer enabling 8-rank operation for ultra-high density
• CL19 latency at 2666MHz for DDR4 LRDIMM performance at maximum density
• 1.2V operation with full LRDIMM electrical load reduction
• HPE-certified for ProLiant Gen10 platforms requiring maximum per-slot DDR4 capacity

Product Specifications

• Part Number: 840760-091
• Manufacturer: HPE
• Capacity: 128GB
• Type: DDR4 ECC Load Reduced DIMM (LRDIMM)
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• Ranks x Width: 8Rx4
• Pins: 288-Pin

Memory Specifications

• ECC: Yes — ECC Load Reduced (LRDIMM)
• Form Factor: DIMM (288-pin, full-height)
• Error Correction: SECDED ECC with LRDIMM data buffer
• Memory Standard: PC4-21300 (DDR4-2666)

Performance Specifications

• Bandwidth: Up to 21,333 MB/s theoretical peak per channel
• ECC Type: SECDED with LRDIMM 8-rank data buffer abstraction
• RAS Features: ECC, memory mirroring, rank sparing (platform dependent)

Use Cases

• Maximum DDR4 memory density per slot in HPE ProLiant Gen10 multi-socket servers
• SAP HANA, in-memory analytics, and large-scale OLAP workloads requiring maximum DRAM capacity
• High-density VM consolidation requiring large per-server memory on HPE Gen10 4-socket servers
• HPE DL580 Gen10 and similar high-memory-capacity platforms needing 128GB LRDIMM modules

Compatibility

• HPE ProLiant Gen10 servers supporting DDR4 LRDIMM and 8Rx4 configurations: DL560, DL580 Gen10
• Requires Intel Xeon Scalable 2nd Gen (Cascade Lake) processors for 128GB LRDIMM support
• Not all Gen10 servers support 8Rx4 128GB LRDIMMs — verify HPE QuickSpecs per server model
• Cannot be mixed with RDIMM modules in the same server

Frequently Asked Questions

Which HPE servers support 128GB LRDIMM modules like the 840760-091?

128GB DDR4-2666 8Rx4 LRDIMMs are typically supported in HPE”s highest-memory-capacity platforms: DL560 Gen10 and DL580 Gen10 with Intel Xeon Scalable 2nd Gen (Cascade Lake) processors. The DL360 and DL380 Gen10 may support 128GB LRDIMMs in select configurations — always verify via HPE”s server QuickSpecs and memory configurator.

What is 8Rx4 and how does it enable 128GB per DIMM?

8Rx4 means 8 ranks of x4-width DRAM chips — the maximum rank density achievable on a DDR4 DIMM. LRDIMM data buffers electrically isolate all 8 ranks from the memory bus, making it feasible for memory controllers to address the full 128GB per slot. Without LRDIMM buffering, 8-rank configurations would exceed the electrical loading limits of standard DDR4 channels.

Does the 840760-091 run at 2666MHz in all HPE Gen10 servers?

The 840760-091 is rated at DDR4-2666, but actual operating speed depends on the installed processor and memory channel configuration. With Cascade Lake Xeon processors, DDR4-2666 LRDIMM typically operates at rated speed in 1 or 2 DIMMs per channel. Higher DIMM density per channel may reduce effective operating speed — verify via HPE”s memory configurator.

The HPE 840760-091 delivers the maximum DDR4 density achievable in a single DIMM slot — 128GB at DDR4-2666 in an 8Rx4 LRDIMM configuration — providing the ultra-high per-slot memory capacity that HPE ProLiant Gen10 servers require for SAP HANA, in-memory analytics, and the most memory-intensive enterprise workloads.