HPE 32GB DDR4-2666 ECC Registered DIMM — 815100-B21

The HPE 815100-B21 is a 32GB DDR4-2666 (PC4-21300) ECC Registered DIMM in a dual-rank 2Rx4 configuration for HPE ProLiant Gen10 servers. Operating at 1.2V with CL19 latency, it is the standard option kit procurement version for this capacity and speed point, delivering ECC-protected bandwidth for enterprise virtualization, database, and application server workloads.

Key Features

• 32GB DDR4-2666 RDIMM option kit — standard procurement for ProLiant Gen10 memory expansion
• 2666MHz (PC4-21300) bandwidth for Intel Xeon Scalable 1st/2nd Gen platforms
• Dual-rank 2Rx4 configuration balancing per-slot capacity and channel throughput
• 1.2V low-voltage ECC registered operation for energy-efficient server memory

Product Specifications

• Part Number: 815100-B21
• 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 memory upgrades at 32GB per slot DDR4-2666
• Enterprise virtualization hosts requiring balanced capacity and bandwidth
• Database application servers on Intel Xeon Scalable Skylake/Cascade Lake Gen10
• General-purpose server memory expansion in dual-socket ProLiant Gen10 configurations

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 is the difference between 815100-B21, 850881-001, and 840758-091?

All three are HPE 32GB DDR4-2666 2Rx4 ECC RDIMM modules with identical specifications. 815100-B21 is the option kit, 850881-001 is the spare part, and 840758-091 is the factory/OEM configuration variant — they are functionally interchangeable.

Is 815100-B21 compatible with HPE ProLiant Gen9 servers?

Gen9 servers support DDR4-2133 and DDR4-2400. A DDR4-2666 module may operate at a reduced speed in Gen9 — verify with HPE ProLiant Gen9 QuickSpecs before deployment.

What is the maximum memory capacity in a DL380 Gen10 using 815100-B21?

The DL380 Gen10 supports up to 24 DIMM slots in a 2-socket configuration. At 32GB per slot, maximum capacity with 815100-B21 is 768GB. Consult HPE QuickSpecs for population rules.

The HPE 815100-B21 32GB DDR4-2666 RDIMM is the standard option kit for ProLiant Gen10 server memory expansion. Order today — in stock at the lowest price with fast shipping.