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Green 288-pin DDR4 DIMM with black chips and gold contacts

A-Tech

A-Tech 16GB DDR4 2666 ECC RDIMM 1Rx4 HP 1XD85AA 825109-091 838081-B21 867855-B21 872837-C91 Server Memory

SKU CH-AT6M-84MRE

16 GB DDR4 2666 ECC registered DIMM for HP servers, CL19 1.2 V 288-pin module

  • Total capacity16 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • ECC protection guards data integrity with registered DDR4 2666 operation
  • 16GB capacity expands server workloads using a single 288-pin module
  • CL19 latency at 1.20V balances speed and power efficiency
  • 1Rx4 rank organisation optimises density for compatible HP platforms
  • Major-brand chips deliver tested reliability for continuous uptime

16GB DDR4 2666 ECC RDIMM for HP Servers

This registered DIMM delivers 16GB of error-correcting DDR4 memory at 2666MHz. It is built for HP server and workstation platforms that require registered ECC modules. The single-rank 1Rx4 organisation uses major-brand chips at the standard 1.2V DDR4 voltage.

Registered ECC with 1Rx4 organisation

The module is a registered ECC RDIMM, not an unbuffered UDIMM or load-reduced LRDIMM. That distinction decides whether the memory will initialise on your HP system. The 1Rx4 rank layout and CL19 latency match the original HP part specifications listed for this upgrade.

Major-brand chips tested for server reliability

A-Tech assembles each module with major-brand DRAM components and subjects every stick to quality-assurance testing before shipment. The result is a drop-in replacement for HP part numbers such as 825109-091 and 872837-C91 that is backed by a lifetime warranty and US-based technical support.

How it compares

Measured against everything we stock in ECC Server RAM, at today’s prices. Recalculated every night.

Price $121.99
Cheaper than about 61% of the 6,523 comparable items (median $188.99).
Total capacity 16 GB
Lower than about 60% of the 6,064 comparable items (median 32 GB).
Price per GB $7.62 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

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Specifications

Product
Brand nameA-Tech
Total capacity16 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx4
Power
Rated voltage1.2 V

Questions about this item

What does the 2666MHz speed mean once the module is installed in a server?

The module runs at 2666MHz PC4-21300 with CL19 latency, delivering the rated throughput when the platform supports DDR4 2666 operation.

How does the DDR4 288-pin RDIMM interface limit performance in practice?

The registered DDR4 DIMM uses the standard 288-pin interface at 1.20V, so maximum speed is capped by the memory controller and platform qualification.

What physical slot and clearance does this 1Rx4 ECC RDIMM require?

It fits a standard 288-pin DDR4 DIMM slot; the 1Rx4 registered design matches the mechanical and electrical layout for compatible HP server boards.

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