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Green rectangular circuit board with gold edge connector and black memory chips

AddOn

AddOn UCS-ML-X64G4RS-H-AM 64GB DDR4 2666 CL17 ECC Registered server RAM

SKU CH-1RC4-QAASS MPN UCS-ML-X64G4RS-H-AM

64 GB DDR4 ECC registered module running at 2666 MHz with CL17 latency and 1.20 V operation

  • Total capacity64 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latencyCL17
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Product type288-Pin DDR4 SDRAM
  • 64 GB capacity supports heavy multitasking and large datasets
  • DDR4 2666 (PC4 21300) speed enables fast data throughput
  • ECC Registered design detects and corrects memory errors
  • CL17 CAS latency provides responsive access timing
  • 20 V operation reduces power draw per module

64 GB DDR4 2666 Registered ECC Module

This 64 GB DDR4 2666 registered ECC module is built for servers and workstations that need large, error-correcting memory capacity. The 288-pin DIMM runs at 1.20 V with a CL17 latency profile. It targets administrators scaling up multi-socket platforms where data integrity matters.

Upgrading from smaller or unbuffered DIMMs

Replacing lower-capacity or non-ECC sticks with this registered module adds 64 GB per slot and enables error correction across the memory bus. The jump is worth it when workloads exceed current physical memory or when uncorrected errors risk silent data corruption in critical applications.

Fits 288-pin DDR4 registered channels

The module installs in standard 288-pin DDR4 registered memory channels that support 1.20 V operation. It frees DIMM slots by delivering 64 GB in a single rank-dense package, leaving room for future expansion within the platform's maximum slot count.

How it compares

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

Price $950.99
Pricier than about 80% of the 6,523 comparable items (median $188.99).
Total capacity 64 GB
Higher than about 70% of the 6,064 comparable items (median 32 GB).
Price per GB $14.86 per GB
Pricier than about 75% of the 6,064 comparable items (median $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 nameAddOn - Network Upgrades
Model nameUCS-ML-X64G4RS-H-AM
Total capacity64 GB
Product type288-Pin DDR4 SDRAM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latencyCL17
ECC supportYes
Buffer typeRegistered
Power
Rated voltage1.2 V
Size & build
Shipping weight0.23 kg
Package size178 × 51 × 13 mm

Questions about this item

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

The module uses the standard 288-pin DDR4 form factor, so it fits any server board with DDR4 registered DIMM slots.

How do I install the registered ECC memory correctly?

Power down the server, open the chassis, align the notch on the 288-pin edge connector with the slot key, press firmly until both retention clips click, then verify the full 64 GB appears in BIOS.

When should I consider replacing the 64 GB DDR4 2666 CL17 kit?

Replace the kit if memory diagnostics report uncorrectable ECC errors, if the system fails to POST at the rated 2666 MT/s speed, or when a platform upgrade requires a different memory generation.

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