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Green 288-pin DDR4 DIMM with black chips and silver heatsink

Black Diamond Memory

Black Diamond Memory BD128G2666MQR96 128GB DDR4 2666 ECC Registered server RAM

SKU CH-W45H-00W9K MPN BD128G2666MQR96

128 GB DDR4 2666 ECC registered server memory with 288-pin 4Rx4 design

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • Buffer typeRegistered
  • Memory rank4Rx4
  • Product type288-Pin DDR4 SDRAM
  • Key featuresWith decades of experience specializing in memory and server

Capacity 128GB

Rank 4Rx4

  • 128 GB capacity supports large datasets
  • DDR4 2666 speed delivers 21300 bandwidth
  • ECC registered design protects data integrity
  • 4Rx4 rank organisation maximises density
  • 288-pin DDR4 form factor fits server slots

128GB DDR4 2666 ECC Registered Module

This 128GB DDR4 2666 (PC4 21300) module delivers high-capacity, error-correcting memory for enterprise servers. It uses a 288-pin registered design with a 4Rx4 rank structure to maintain signal integrity on heavily populated motherboards. The specification suits workloads that demand maximum density per slot.

Suited for registered ECC platforms only

The registered buffer and ECC function require a server-class memory controller; desktop or consumer boards that accept only unbuffered non-ECC UDIMMs cannot use this module. Buyers who need standard desktop memory should look at unbuffered alternatives instead.

4Rx4 rank configuration decides slot population

The quad-rank 4Rx4 organisation increases electrical load on each channel, so the motherboard’s qualified-vendor list and maximum rank-per-channel limit determine whether this 128GB stick can be installed alongside other modules.

How it compares

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

Price $2,341.99
Pricier than about 89% of the 6,523 comparable items (median $188.99).
Total capacity 128 GB
Higher than about 90% of the 6,064 comparable items (median 32 GB).
Price per GB $18.30 per GB
Pricier than about 79% of the 6,064 comparable items (median $7.25 per GB).

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Specifications

Product
Brand nameBlack Diamond Memory
Model nameBD128G2666MQR96
Total capacity128 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
ECC supportYes
Buffer typeRegistered
Memory rank4Rx4
Size & build
Shipping weight0.18 kg
Package size178 × 51 × 13 mm

Other versions of this model

5 more in the same range

Questions about this item

Does the 288-pin DDR4 module fit my server's registered DIMM slots?

Yes, the 288-pin DDR4 form factor matches standard registered server DIMM slots that accept DDR4 2666 ECC memory.

What BIOS setting is often missed when installing 4Rx4 registered ECC modules?

Enable ECC and registered mode in the BIOS; some platforms default to unbuffered operation and will not recognise the 4Rx4 modules without it.

When should I consider replacing these 128GB DDR4 2666 sticks?

Replace them if memory diagnostics report correctable ECC errors that increase over time, or when upgrading to a platform that requires a newer DDR generation.

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