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A green rectangular DDR4 RDIMM module with gold edge connectors and black memory chips, no heat spreader

OWC

OWC 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC Registered RDIMM 2R9D48R4128G

SKU CH-JE4K-KJGF2

A single 128 GB DDR4 2933 ECC registered RDIMM with CL21 latency and 1.2 V operation for compatible ASUS rack servers

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128GB single-module capacity for high-density server memory
  • ECC registered design detects and corrects data errors automatically
  • DDR4 2933MHz CL21 speed with 1.2V low-voltage operation
  • Validated for ASUS RS720-E9 rack server series compatibility
  • JEDEC and RoHS compliant for warranty-safe upgrades

128 GB DDR4 ECC RDIMM for ASUS RS720 servers

This 128 GB DDR4 2933 module is built for ASUS Rack Server RS720-E9 models including RS24-E, RS24-U, RS8 and RS8-G. It operates at PC4-23400 with CL21 latency and 1.2 V. The registered ECC design targets enterprise workloads that demand data integrity.

Not for desktop or unbuffered systems

The module is an 8Rx4 registered ECC RDIMM and will not work in standard desktop motherboards. It cannot be mixed with unbuffered or load-reduced ECC memory. Buyers needing consumer DDR4 or non-ECC memory should choose a different product.

Sustained load behaviour

JEDEC-standard construction and 1.2 V operation keep power draw steady during continuous server duties. Backward compatibility with 2133, 2400 and 2666 MHz speeds allows the module to clock down without errors when the platform requires lower frequencies.

How it compares

Measured against everything we stock in Model-Specific Memory Upgrades, at today’s prices. Recalculated every night.

Price $632.99
Pricier than about 55% of the 21,161 comparable items (median $397.99).
Total capacity 128 GB
Higher than about 70% of the 20,941 comparable items (median 32 GB).
CAS latency 21
Lower than about 63% of the 483 comparable items (median 22).
Price per GB $4.95 per GB
Cheaper than about 77% of the 20,941 comparable items (median $8.19 per GB).

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Specifications

Product
Brand nameOWC
Part number2R9D48R4128G
Total capacity128 GB
Product type288-Pin DDR4 ECC RDIMM
Performance
Rated speedDDR4 2933 (PC4 23400)
Memory
CAS latency21
ECC supportYes
Buffer typeRegistered
Memory rank8Rx4
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Compatible systemsASUS Rack Server RS720-E9-RS24-E
ASUS Rack Server RS720-E9-RS24-U
ASUS Rack Server RS720-E9-RS8
ASUS Rack Server RS720-E9-RS8-G
ASUS Rack Server RS720-E9-RS12-E

Questions about this item

Do I need an ASUS RS720-E9 rack server with DDR4 RDIMM slots to install this 128GB module?

Yes, this 288-pin DDR4 ECC Registered DIMM is validated for the RS720-E9-RS24-E, RS720-E9-RS24-U, RS720-E9-RS8, RS720-E9-RS8-G and RS720-E9-RS12-E. Standard desktop boards cannot accept registered memory.

Will this PC4-23400 CL21 2933MHz module run with existing 2133MHz, 2400MHz or 2666MHz DDR4 RDIMMs in the same server?

The module is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds; the system will clock all installed RDIMMs to the lowest common frequency. Do not mix with unbuffered or load-reduced DIMMs.

How can I verify the 128GB 8Rx4 module is detected at 2933MHz with ECC active after installation?

Check the BIOS memory summary or OS tools such as dmidecode to confirm 128GB capacity, 2933MHz speed, CL21 timing, 1.2V voltage and ECC Registered status.

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