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Green circuit board with black memory chips and gold edge connectors

OWC

OWC 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin ECC Registered RDIMM server RAM

SKU CH-VFQP-X28QG

Single 128GB DDR4 2666 ECC registered RDIMM for servers, workstations and NAS systems, CL19 at 1.2V

  • Total capacity128 GB
  • Rated speedDDR4 2666 (PC4 21300)
  • CAS latency19
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB capacity expands server memory headroom
  • ECC registered design protects data integrity
  • DDR4 2666 speed delivers high bandwidth
  • JEDEC and RoHS compliant for warranty-safe upgrades
  • Backward compatible with 2133MHz and 2400MHz systems

128GB DDR4 2666 ECC Registered RDIMM

This single 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC Registered RDIMM is built for servers, workstations and NAS systems that require registered memory with error correction. It will not work in standard desktop computers and cannot be mixed with unbuffered or load-reduced DIMMs.

Check registered ECC support and rank limits

Verify that your platform accepts 288-pin DDR4 Registered ECC modules and supports 8Rx4 rank configurations before ordering. The memory is backward compatible with 2133MHz and 2400MHz bus speeds, so it will down-clock automatically if the system runs at those lower frequencies.

Replaces Cisco UCS-MR-128G8RS-H

This module directly replaces the Cisco UCS-MR-128G8RS-H, Dataram DRC2666TR/128GB and DRV2666R/128GB, and S26361-F4026-E728 part numbers. The upgrade is worth it when you need maximum capacity per slot in a compatible registered ECC platform and want a JEDEC-standard, RoHS-compliant alternative with a limited lifetime warranty.

How it compares

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

Price $763.99
Pricier than about 76% 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).
CAS latency 19
Lower than about 91% of the 439 comparable items (median 40).
Price per GB $5.97 per GB
Cheaper than about 64% 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 nameOWC
Part number2R6D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2666 (PC4 21300)
Memory
CAS latency19
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V

Questions about this item

Does the 128GB 288-pin ECC Registered RDIMM arrive as a single module, or must additional sticks be purchased separately?

The upgrade consists of one 128GB DDR4 2666 PC4-21300 CL19 8Rx4 288-pin 1.2V ECC Registered DIMM; no extra modules are required for this capacity.

Should I choose the 2666MHz CL19 version or a lower-speed alternative for my server?

This module runs at 2666MHz CL19 and is backward compatible with 2133MHz and 2400MHz systems, so it covers all three speeds in one part.

What does the PC4-21300 rating mean once the DIMM is installed in a registered-memory server?

PC4-21300 indicates a peak transfer rate of 21300 MB/s at 2666MHz with CL19 latency, delivering that bandwidth when the platform supports registered ECC DDR4.

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