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HP 8GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin DIMM 1.2V Single Rank x8 Memory Module - 864706-591

HP 8GB 2666MHz DDR4 PC4-21300 ECC Registered CL19 288-Pin DIMM 1.2V Single Rank x8 Memory Module - 864706-591

Part Number: 864706-591
Manufacturer: HP

Condition: Refurbished

Weight: 0.1 lbs

AvailabilityIn stock

Regular price $95.00
Regular price Sale price $95.00
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HP 864706-591 8GB DDR4-2666 ECC RDIMM — 1Rx8 Server Memory

The HP 864706-591 is an 8GB DDR4-2666 ECC Registered DIMM providing single-rank x8 server memory for HPE ProLiant Gen9 and Gen10 servers — delivering CL19 latency at 2666MHz (PC4-21300) with 1.2V operation and full ECC error correction for reliable memory capacity expansion in HPE server platforms.

Key Features

  • 8GB DDR4-2666 ECC RDIMM — 1Rx8 single-rank configuration for density-efficient memory expansion
  • CL19 latency at 2666MHz for optimized DDR4 memory performance
  • Full ECC error detection and correction for HP ProLiant server reliability
  • 288-pin DDR4 DIMM for standard HPE server DIMM slot compatibility
  • 1.2V low-voltage operation for energy-efficient server memory

Product Specifications

  • Part Number: 864706-591
  • Manufacturer: HP / HPE
  • Capacity: 8GB
  • Type: DDR4 ECC Registered DIMM (RDIMM)
  • Speed: 2666MHz (PC4-21300)
  • CAS Latency: CL19
  • Voltage: 1.2V
  • Ranks x Width: 1Rx8
  • Pins: 288-Pin

Memory Specifications

  • ECC: Yes — ECC Registered
  • Form Factor: DIMM (288-pin, full-height)
  • Error Correction: Single-bit error correction, multi-bit error detection
  • Memory Standard: PC4-21300 (DDR4-2666)

Performance Specifications

  • Bandwidth: Up to 21,333 MB/s theoretical peak
  • ECC Type: SECDED (Single Error Correct, Double Error Detect)
  • RAS Features: ECC, memory mirroring support (platform dependent)

Use Cases

  • 8GB RDIMM capacity expansion for HPE ProLiant Gen9 and Gen10 server platforms
  • Entry-level server memory upgrade for light workload and virtualization hosts
  • Replacing failed or degraded 8GB RDIMM slots in HPE ProLiant Gen9/Gen10
  • Mixed-capacity DIMM configurations in HPE servers requiring 8GB per-slot density

Compatibility

  • HPE ProLiant Gen9 servers: DL360, DL380, DL560, DL580 Gen9 and related platforms
  • HPE ProLiant Gen10 servers: DL360, DL380, DL560, DL580 Gen10 and related platforms
  • Verify maximum RDIMM speed support per HPE server model before installation
  • Not compatible with non-ECC or UDIMM-only server configurations

Frequently Asked Questions

What is the difference between 864706-591 and 864706-B21?
The 864706-591 and 864706-B21 are equivalent HP part numbers for the same 8GB DDR4-2666 ECC RDIMM — the -591 suffix is the HPE factory-integrated / bulk OEM variant, while -B21 is the standard HPE option kit for retail/channel ordering. Both are functionally identical for server memory operation.
Is the 864706-591 compatible with both Gen9 and Gen10 HPE ProLiant servers?
Yes — the 8GB DDR4-2666 RDIMM is compatible with both HPE Gen9 and Gen10 ProLiant servers that support DDR4-2666 ECC Registered DIMMs. Always verify your specific server model's memory compatibility matrix via the HPE Memory Configurator before installation.
Can 864706-591 modules be mixed with other DDR4-2666 RDIMMs in the same server?
DDR4 RDIMMs of the same speed can generally be mixed across DIMM slots, but HPE recommends using identical modules within each memory channel for optimal performance and guaranteed compatibility. Consult your server's memory population guide for recommended mixing rules.

The HP 864706-591 provides 8GB DDR4-2666 ECC RDIMM capacity in a 1Rx8 single-rank configuration — delivering CL19 server memory performance with 1.2V efficiency and full ECC protection for HPE ProLiant Gen9 and Gen10 server memory expansion and replacement applications.

Frequently Asked Questions

Why do I see an incorrect image for this item?

Product images are meant for illustrative purposes alone, and you may not always see the original image.

What do you mean by term Refurbished?

Refurbished means a used computer part or device that has been cleaned, checked, and repaired to make sure it works properly again. Unlike regular second-hand items, refurbished products go through testing and fixing so they can perform like new.

How many days does it take to ship goods to customers?

All orders are processed within 1-2 business days. Orders placed on weekends or public holidays will be processed on the next business day. For more info visit shipping policy.

What is your return policy?

Our Return Policy comprises a 30-day warranty for Refurbished products. There will be a restocking fee applied when you return non-defective returns. For further details, kindly take a look at our Return Policy page.

Do you deliver my ordered items in their original retail box?

For Brand New items, you will receive them in their original retail box. For Refurbished items, you will receive them in a Brown Box or Bulk Packaging.

Do your printers come with ink cartridges?

Refurbished printers do not come with ink cartridges or toners.