We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Green 288-pin DDR4 ECC registered RDIMM module with black chips, no heat spreader

OWC

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

SKU CH-R48J-AQ95R

A single 128GB DDR4 2933MHz ECC registered RDIMM for compatible ASRock server and workstation motherboards

  • Total capacity128 GB
  • Rated speedDDR4 2933 (PC4 23400)
  • CAS latency21
  • Rated voltage1.2 V
  • Buffer typeRegistered
  • Memory rank8Rx4
  • 128 GB capacity in a single module
  • ECC registered design protects data integrity
  • JEDEC-standard DDR4-2933 CL21 at 1.2 V
  • Compatible with listed ASRock EP2C622 and EPC621 server boards
  • Backward compatible with 2133, 2400 and 2666 MHz speeds

Server ECC RDIMM Upgrade

This 128GB DDR4 registered DIMM is built for ASRock server motherboards including the EP2C622D16-2T, EP2C622D24LM2, EPC621D4I-2M, EPC621D6U-2T16R and WC621D8A-2T. It targets administrators who need ECC registered memory for workstation, server or NAS workloads. Standard desktop systems cannot use this module.

Capacity And Speed Headroom

The single module delivers 128GB at DDR4 2933 PC4-23400 with CL21 latency and 1.2V operation. JEDEC backward compatibility lets it run at 2666, 2400 or 2133MHz when the platform requires lower speeds. The 8Rx4 organisation suits dense configurations but cannot be mixed with unbuffered or load-reduced DIMMs.

Build And Connector Notes

The 288-pin RDIMM form factor fits server DIMM slots directly without a heat spreader. Registered signalling and on-board ECC provide the data integrity expected in multi-socket or mission-critical deployments. Compliance with JEDEC and RoHS standards supports warranty-safe upgrades across the listed ASRock platforms.

How it compares

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

Price $675.99
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 $5.28 per GB
Cheaper than about 73% of the 20,941 comparable items (median $8.19 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 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

Questions about this item

Will this 2933MHz DDR4 ECC registered module run stably alongside my existing 2400MHz sticks in the ASRock EP2C622D16-2T?

Yes, the module is backward compatible with 2133MHz, 2400MHz and 2666MHz speeds, so it will clock down to match your slower DIMMs while keeping ECC registered operation.

How can I confirm the 128GB 8Rx4 module is detected correctly after installation?

Check the BIOS memory summary or OS tool such as dmidecode; it should show a single 128GB DDR4 2933 CL21 ECC registered DIMM at 1.2V with 8Rx4 organisation.

Does the package include only the 288-pin RDIMM or are any brackets or cables supplied?

Only the 128GB DDR4 2933 PC4-23400 CL21 8Rx4 288-pin 1.2V ECC registered RDIMM is included; no brackets, cables or additional hardware are provided.

More in Model-Specific Memory Upgrades

Similar items