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Green PCB DDR4 RDIMM module with black heat spreader and gold contacts

A-Tech

A-Tech 8GB DDR4 2666 ECC RDIMM 1Rx8 for HP 1XD84AA 1XD84AT 838079-B21 872836-091 Server Memory

SKU CH-CDJH-7TWD4

8GB DDR4 2666 ECC RDIMM 1Rx8 server memory module for HP compatibility

  • Total capacity8 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • ChipsetMajor Brand Chipset
  • CAS latencyCL19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • ECC protection prevents data corruption with registered DDR4 2666 CL19 operation
  • 8 GB capacity expands server workloads using single 1Rx8 registered DIMM
  • 20 V DDR4 standard voltage reduces power draw in 288-pin form factor
  • Major-brand chipset ensures reliable compatibility with HP 838079-B21 and 872836-091
  • Lifetime warranty backs quality-tested modules for long-term server deployment

HP Server Compatibility

This A-Tech module is an 8 GB DDR4 2666 ECC RDIMM built to replace HP part numbers 1XD84AA, 1XD84AT, 838079-B21 and 872836-091. It uses a 288-pin DIMM form factor, runs at 1.20 V and carries a CL19 latency rating for registered server platforms.

Upgrade Path Considerations

The stick adds a single 1Rx8 rank to a compatible HP server or workstation, raising total memory capacity without changing voltage or speed. The jump is worth it when the system supports DDR4 2666 registered ECC memory and has free DIMM slots for expansion.

Target Users And Limits

It suits administrators extending memory in the listed HP models where registered ECC DDR4 2666 is qualified. Builders needing unbuffered UDIMMs, higher frequencies, larger single-module capacities or non-ECC memory for desktop platforms should look elsewhere.

How it compares

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

Price $56.99
Cheaper than about 82% of the 6,523 comparable items (median $188.99).
Total capacity 8 GB
Lower than about 80% of the 6,064 comparable items (median 32 GB).
Price per GB $7.12 per GB
Typical for this category: the median of 6,064 items is $7.25 per GB.

New to this? Buying memory and SSDs with crypto — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameA-Tech
Total capacity8 GB
Performance
Rated speedDDR4 2666 (PC4 21300)
Processor
ChipsetMajor Brand Chipset
Memory
CAS latencyCL19
ECC supportYes
Buffer typeRegistered
Memory rank1Rx8
Power
Rated voltage1.2 V

Questions about this item

What slot type does this 288-pin DDR4 RDIMM need on the motherboard?

It requires a DDR4 DIMM socket with 288 pins that supports registered ECC modules at 1.20 V.

Which step do installers most often miss when seating this 1Rx8 module?

Aligning the notch with the key and pressing straight down until both retention clips click locked.

How can I tell if a chip on this 8GB ECC RDIMM has failed?

The module will log correctable ECC errors; uncorrectable errors or repeated POST failures indicate replacement.

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