HPE 32GB DDR4-2666 ECC Registered DIMM — 840758-091

The HPE 840758-091 is a 32GB DDR4-2666 (PC4-21300) ECC Registered DIMM carrying an HPE factory/OEM configuration suffix for HPE ProLiant Gen10 servers. With dual-rank 2Rx4 architecture, 1.2V operation, and CL19 latency, it is the factory-configured procurement variant of the 815100-B21 option kit — hardware is functionally identical.

Key Features

• 32GB DDR4-2666 RDIMM factory variant — same specifications as 815100-B21 in -091 configuration
• 2666MHz (PC4-21300) for Intel Xeon Scalable Gen10 server platforms
• Dual-rank 2Rx4 registered architecture for multi-DIMM signal integrity
• 1.2V low-voltage ECC operation for energy-efficient Gen10 memory deployment

Product Specifications

• Part Number: 840758-091
• Manufacturer: HPE
• Capacity: 32GB
• Type: DDR4 ECC Registered (RDIMM)
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• Ranks x Width: 2Rx4
• Pins: 288-pin

Memory Specifications

• Memory Standard: JEDEC DDR4-2666
• Error Correction: ECC (Error Correcting Code)
• Buffer Type: Registered (RDIMM)
• DRAM Generation: DDR4

Performance Specifications

• Peak Bandwidth: ~42.7 GB/s (PC4-21300)
• ECC Type: Single-bit error correction, multi-bit error detection
• RAS Features: Advanced ECC, rank sparing, memory mirroring (platform dependent)

Use Cases

• HPE ProLiant Gen10 factory-configured memory replacement and expansion
• Virtualization and enterprise database workloads on Gen10 Xeon Scalable platforms
• Field replacement for factory-installed 32GB DDR4-2666 RDIMM modules in ProLiant Gen10
• Mixed-procurement memory pool alongside 815100-B21 and 850881-001 equivalents

Compatibility

• HPE ProLiant DL380 Gen10, DL360 Gen10, DL180 Gen10
• HPE ProLiant ML350 Gen10, BL460c Gen10
• Intel Xeon Scalable 1st/2nd Generation (Skylake-SP / Cascade Lake-SP) supporting DDR4-2666

Frequently Asked Questions

What does the -091 suffix indicate on HPE part 840758-091?

The -091 suffix is an HPE factory/OEM configuration designation, indicating factory-integrated procurement as opposed to a retail option kit (-B21) or spare part (-001). The hardware is functionally equivalent to 815100-B21.

Is 840758-091 interchangeable with 815100-B21 and 850881-001?

Yes — all three are HPE 32GB DDR4-2666 2Rx4 ECC RDIMM modules with identical specifications and are fully interchangeable in HPE ProLiant Gen10 supported configurations.

Can 840758-091 be mixed with 16GB DDR4-2666 RDIMMs in the same server?

Mixing DIMM capacities in the same memory channel is not recommended and may result in speed downgrades. Consult HPE ProLiant Gen10 QuickSpecs for validated mixed-capacity population rules.

The HPE 840758-091 32GB DDR4-2666 RDIMM is the factory-configured memory variant for HPE ProLiant Gen10 deployments. Order today — in stock at the best price.