HPE 64GB DDR4-2666 ECC Load Reduced DIMM — 815101-B21

The HPE 815101-B21 is a 64GB DDR4-2666 (PC4-21300) ECC Load Reduced DIMM in a quad-rank 4Rx4 configuration and is the standard option kit for HPE ProLiant Gen10 servers. Operating at 1.2V with CL19 latency, the LRDIMM buffer enables 4 ranks per slot for high-density memory configurations on Intel Xeon Scalable Gen10 platforms.

Key Features

• 64GB DDR4-2666 LRDIMM option kit — quad-rank high-density Gen10 server memory
• 2666MHz (PC4-21300) with load-reduced buffer for maximum rank population per slot
• 4Rx4 architecture delivering 64GB per slot for memory-intensive enterprise workloads
• 1.2V energy-efficient operation with full ECC protection on 288-pin DDR4 interface

Product Specifications

• Part Number: 815101-B21
• Manufacturer: HPE
• Capacity: 64GB
• Type: DDR4 ECC Load Reduced (LRDIMM)
• Speed: 2666MHz (PC4-21300)
• CAS Latency: CL19
• Voltage: 1.2V
• Ranks x Width: 4Rx4
• Pins: 288-pin

Memory Specifications

• Memory Standard: JEDEC DDR4-2666
• Error Correction: ECC (Error Correcting Code)
• Buffer Type: Load Reduced (LRDIMM)
• 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, memory mirroring, rank sparing (platform dependent)

Use Cases

• HPE ProLiant Gen10 high-density 64GB per slot LRDIMM memory builds
• In-memory databases and large-scale virtualization requiring more than 32GB per slot
• Enterprise analytics workloads on Xeon Scalable Gen10 with high memory capacity demands
• Mid-range density option between 32GB RDIMM and 128GB LRDIMM configurations

Compatibility

• HPE ProLiant DL380 Gen10, DL360 Gen10, DL560 Gen10
• HPE ProLiant ML350 Gen10, BL460c Gen10
• Intel Xeon Scalable 1st/2nd Generation (Skylake-SP / Cascade Lake-SP) supporting DDR4-2666 LRDIMM

Frequently Asked Questions

What is the difference between 815101-B21 (64GB LRDIMM) and 815100-B21 (32GB RDIMM)?

815101-B21 is a 64GB 4Rx4 LRDIMM using a load-reduced buffer to support quad-rank density. 815100-B21 is a 32GB 2Rx4 RDIMM without a buffer. The LRDIMM delivers twice the capacity per slot at the cost of slightly higher latency. Mixing LRDIMM and RDIMM types in the same server is not supported.

Is 815101-B21 compatible with HPE ProLiant Gen9 servers?

Gen9 servers support DDR4-2400 and earlier. A DDR4-2666 LRDIMM may operate at reduced speed in Gen9 — verify against HPE ProLiant Gen9 QuickSpecs and LRDIMM support before deployment.

What is the maximum memory using 815101-B21 in a DL380 Gen10?

With 24 DIMM slots and 64GB per slot, maximum capacity is 1.5TB using 815101-B21 LRDIMMs in a DL380 Gen10. Consult HPE QuickSpecs for LRDIMM-specific population and speed rules.

The HPE 815101-B21 64GB DDR4-2666 LRDIMM option kit delivers high-density ECC server memory for HPE ProLiant Gen10 deployments. Get it in stock today at a competitive price.